ZK Spreadsheet 3.9.1
*Features:
  ZSS-1267 Show busy message for client-side rendering
  ZSS-1274 Support F2 to toggle arrow keys's function when editing formula
  ZSS-1210 Support Excel 2010 statistical functions: BINOM.INV,NORM.INV,LOGNORM.DIST,LOGNORM.INV,
		   BETADIST,BETAINV,CRITBINOM,CHISQ.DIST,CHISQ.INV,CORREL,EXPONDIST,LOGINV,NORMDIST,
		   NEGBINOMDIST,POISSON,POISSON.INV
  ZSS-1235 Support those statistical functions renamed in Excel 2010: BINOM.DIST,CHISQ.DIST.RT,CHISQ.INV.RT,
           EXPON.DIST,F.DIST.RT,F.INV.RT,GAMMA.DIST,GAMMA.INV,HYPGEOM.DIST,MODE.SNGL,NORM.DIST,POISSON.DIST,
		   RANK.EQ,STDEV.S,STDEV.P,T.INV.2T,VAR.P,VAR.S,WEIBULL.DIST		   
  ZSS-1236 Support T.DIST.2T and T.DIST.RT from Excel 2010
  ZSS-1262 Improve sorting performance
  ZSS-1283 Improve the performance for initializing cells with formulas
  
*Bugs:
  ZSS-1266 Cannot select an item in a validation dropdown
  ZSS-1260 The validation dropdown doesn't appear in the last column
  ZSS-1259 The validation dropdown is cut when it is in the last row
  ZSS-1209 error message inserting math operators after parenthesis
  ZSS-1238 Inserting a URL into a cell causes it locked
  ZSS-1275 When sheet protected and not allowed to insert link; the inserted LINK should be a String
  ZSS-1257 Conditional formatting displays incorrect result when using row()
  ZSS-1271 Conditional formatting work incorrectly when using a formula
  ZSS-1269 Cannot evaluate eomonth()
  ZSS-1276 Some CSS class names are generated incorrectly with ZK 8.0.2
  ZSS-1270 Conditional formatting cannot accept empty string formula
  ZSS-1281 display an unexpected grey area in a file with a frozen panel
  ZSS-1280 Deleting rows causes ConcurrentModificationException
  ZSS-1261 custom sort doesn't show available column when selecting 1 cell
  ZSS-1256 deleting a row causes ArrayIndexOutOfBoundsException
  ZSS-1277 copy the whole row doesn't copy the row height
  ZSS-1284 Row insertion during initialization causes NPE

** Upgrade Notes
  * Following apis are deprecated:
	* SBook.getOrCreateDefaultHyperlinkStyle(): use SBook.getOrCreateDefaultHyperlinkStyle(SCell cell) instead.
	* WorkbookEvaluator.evaluate(int sheetIndex, String formula, boolean ignoreDereference, Object ref, int[] offset): use
		WorkbookEvaluator.evaluate(int sheetIndex, int rowIndex, int columnIndex, 
				String formula, boolean ignoreDereference, Object ref, int[] offset) instead.
	
 ------------
ZK Spreadsheet 3.9.0
*Features:
  ZSS-1214 Support percentage mask when editing a cell applied with "Percentage" format
  ZSS-1183 Copy a sheet between books
  ZSS-1191 Filter by color
  ZSS-1224 Support Import/export CustomFilters
  ZSS-1192 Support the text filter
  ZSS-1226 Support Import/export DynamicFilter
  ZSS-1227 Support Import/export Top10Filter
  ZSS-1193 Support the number filter
  ZSS-1195 clear filter for a column
  ZSS-1229 Copy and paste only those visible cells when a filter is enabled
  ZSS-1167 Support ZK 8 new specification: <config-name> is required in config.xml
  ZSS-1234 Support date filter
  ZSS-1142 Support to show conditional formatting in the client side
  ZSS-1251 Support copy/paste conditional formatting
  
*Bugs:
  ZSS-1211 StringIndexOutOfBoundsException if click a hyperlink with empty address
  ZSS-1212 Select a sheet and a javascript error is thrown
  ZSS-1215 when the frozen columns number is larger than preloadColumnSize, some areas become blank
  ZSS-1220 Forget to copy over the new attibute in EditableFont
  ZSS-1217 Export to Excel does not match presentation merged cells in Spreadsheet
  ZSS-1223 Cannot find the specified book "profile.xlsx" in this book series: [resume.xlsx]
  ZSS-1222 Problem with external references
  ZSS-1225 right clicking doesn't open a custom context menu
  ZSS-1230 Insert a column inside a filter range makes a filter works incorrectly
  ZSS-1239 Cannot click "Select All" when opening the filter dropdown
  ZSS-1233 The dropdown in Custom autofilter doesn't list all cell values
  ZSS-1241 The filter type should follow the Excel spec.

** Upgrade Notes
  * Fix the method typo from SSheet#getConditonalFormattings() to getConditionalFormattings().
  * Change the return type of the SConditionalFormatting#getRegions() method from List<CellRegion> to Set<CellRegion> 
  * Change the return type of the SDataBar#getMaxLength() and SDataBar#getMinLenght() from Long to int.
  
 ------------
ZK Spreadsheet 3.8.3
*Features:
  
*Bugs:
  ZSS-1200 Fail to delete a sheet
  ZSS-1201 Creating a sheet with a book range causes NullPointerException
  ZSS-1199 a text is cut in a merged cell
  ZSS-1204 Client performance degrades obviously than 3.8.2
  
** Upgrade Notes

 ------------
ZK Spreadsheet 3.8.3.RC
*Features:
  ZSS-1184 Provide an ignoreAutoHeight flag so user can fine tune the performance
  ZSS-992 Support import customized TableStyles
  ZSS-1185 Support custom table style
  ZSS-1188 Support exporting customized TableStyles
  ZSS-1125 Support to get merged regions
  ZSS-1124 Support to get last column/row which contains data
  
*Bugs:
  ZSS-1172 Should remove unnecessary ___ (three underscores) style class
  ZSS-1168 merge cells asynchronously in an event queue handler doesn't work
  ZSS-1164 A cell switches from old value to new value after completing edit under a long network latency
  ZSS-1171 Merge cells cause firefox unresponsive
  ZSS-1174 The preloadColumnSize and preloadRowSize doesn't work as expected
  ZSS-1165 Inconsistent cell editing behavior according to IME/language setting
  ZSS-1162 The format of conditional formatting is changed after exporting
  ZSS-1161 a conditional formatting rule's "show icon only" is checked after exporting
  ZSS-1175 Deleting columns doesn't remove a merged cell with auto refresh disabled
  ZSS-1181 Notify a loaded range is slower than notify an affected range
  ZSS-1170 Alignment problem when export a sheet with hidden columns to PDF
  ZSS-1179 java.io.NotSerializableException: org.zkoss.zssex.ui.impl.UndoableActionManagerImpl
  ZSS-717 Copy/Cut paste a column did not copy the column width over
  ZSS-1186 Importing an Excel table without a header row causes a javascript error
  ZSS-1178 Render a merged cell incorrectly
  ZSS-1180 import bottom alignement incorrectly
  ZSS-1119 Border missing when overlap merged cell
  ZSS-1129 Importing a chart with a FormulaParseException
  ZSS-1189 Fail to import a rich text
  ZSS-1190 Hidden column not saved
  ZSS-1197 a formula becomes a text after being edited
  
** Upgrade Notes

 ------------
ZK Spreadsheet 3.8.2
*Features:
  ZSS-1114 Automatically ignore duplicate merged region when importing
  ZSS-1121 Declare methods as protected for importers and exporters
  ZSS-1126 value() supports date format like 2015-09-05
  ZSS-1127 smart input can convert such date input "2015-09-20" into the date format in US locale
  ZSS-807  Hyperlink support link to "Place in this document"
  ZSS-1137 Support insert "Place In Document" hyperlink
  ZSS-1140 Support import extra styles (dxfs) into SBook(XLSX only)
  ZSS-1130 Support to import conditional formatting rules (XLSX only)
  ZSS-1145 Support exporting Dxf styles (XLSX only)
  ZSS-1141 Support to export conditionalFormatting rules (XLSX only)
  
*Bugs:
  ZSS-1109 The selection box should jump to last filled cell through consecutive filled data when using ctrl + arrow
  ZSS-1118 line breaks splitting words in spreadsheet - regular spaces replaces by nbsp
  ZSS-1117 Merged cells are shifted after scrolling
  ZSS-1120 Fails to export named styles
  ZSS-1123 ZSS always shows time out warning when reloading every time
  ZSS-1134 IE9 only. ScrollPanel position sometimes wrongly reset to 0,0
  ZSS-1135 Gridline doesn't appear after exporting
  ZSS-1132 ExcelXlsxExporter always exports columns as custom width
  ZSS-1116 Wrap a cell which is not in the visible area doesn't work
  ZSS-1138 A rich text is lost after importing
  ZSS-1147 Data validation / browser locale issue
  ZSS-1115 Encounter "Warning: Unresponsive script" in Firefox when setting massive cells
  ZSS-1149 ZSS renders cell borders incorrectly
  ZSS-1150 IE9 only. Underscore("_") not seen when bottom vertical alignment
  ZSS-1151 IE9 only. Row height is unresonable large
  ZSS-1152 IE9 only. Lift the IE9 StyleSheet upper limit (4095 selectors per style sheet)
  ZSS-1155 Space gone in Vertical rotated text (rotate == 255)
  
** Upgrade Notes
    * org.zkoss.poi.ss.usermodel.CellStyle#getIndex() have been changed to return int instead of short because the 
	limit of the distinct cell styles in Excel 2007 and above is 64000 while that of Excel 97-2003 is only 4000;
    have to extend it to accommodate the capacity. Thus the corresponding implementation are changed accordingly.
	  
	* org.zkoss.poi.ss.usermodel.Workbook#getIndexAt(short idx) have been changed to 
	org.zkoss.poi.ss.usermodel.Workbook#getIndexAt(int idx) because the 
	limit of the distinct cell styles in Excel 2007 and above is 64000 while that of Excel 97-2003 is only 4000;
    have to extend it to accommodate the capacity. Thus the corresponding implementation are changed accordingly.
	  
	* org.zkoss.zss.model.util.RichTextHelper.getCellRichTextHtml(SRichText rstr, boolean wrap) have been deprecated
	and a new util method org.zkoss.zss.model.util.RichTextHelper.getCellRichTextHtml(SCell cell, SRichText rstr, boolean wrap)
	has been added to provide more accurate information.
	  
	* org.zkoss.zss.model.util.RichTextHelper.getCellVRichTextHtml(SRichText rstr, boolean wrap) have been deprecated
	and a new util method org.zkoss.zss.model.util.RichTextHelper.getCellVRichTextHtml(SCell cell, SRichText rstr, boolean wrap)
	has been added to provide more accurate information.

 ------------
ZK Spreadsheet 3.8.1
*Features:
  ZSS-1063 Support new password mechanism introduced since 2012
  ZSS-1000 Support ctrl + arrow key
  ZSS-998  Show all online users on the top of the page
  ZSS-1044 Keep selection box visible even when spreadsheet losing focus
  ZSS-1084 Can initialize max row and column automatically by detecting file content
  ZSS-1082 Users can increase max visible rows
  ZSS-1050 Filter by searching for AutoFilter
  
*Bugs:
  ZSS-1020 Rotation info should be included into exported excel file
  ZSS-1064 ZSS does not recognize @Listen events after 3.8.0 update
  ZSS-1055 Comment should not be visible when exporting
  ZSS-1069 Typing a character causes a javascript error
  ZSS-1072 The font "Calibri" is missing from the dropdown in the toolbar
  ZSS-1075 Scroll to right quickly and a javascript error happens
  ZSS-1067 JS Error showed when hiderowhead/hidecolumnhead attribute is set to true
  ZSS-1074 Exported pdf missing background color when setting the color with whole row/column
  ZSS-1073 applying a filter to an empty sheet (area) causes an error
  ZSS-1068 Cannot set background color by EditableCellStyle
  ZSS-1071 Formula bar content messed when moving arrow key
  ZSS-1078 NullPointerException is thrown when importing a file having a protected sheet with empty password
  ZSS-1077 PDF export ignores chinese characters
  ZSS-1076 Toolbar menu icon shouldn't be broken
  ZSS-1080 A formula is moved after switching to another sheet
  ZSS-1079 When editing a formula, switching to another sheet doesn't stop editing
  ZSS-1081 Inconsistent behaviours when entering an incorrect formula and switching to another sheet
  ZSS-929 javascript exception when copy a merged cell, freeze and switch sheet tabs
  ZSS-932 Chart should change label name after cell's value changed
  ZSS-926 Browser's scrollbar moves up to top when frozen column is selected
  ZSS-930 Continuously copy and paste merged cell cause selection error
  ZSS-1085 Press left arrow key on a protected sheet and Javascript busy
  ZSS-1086 Firefox only. Formulabar dost not gain focus when click on formula name.
  ZSS-1083 ZSS scroll back unexpectedly when entering any value under autofilter enabled
  ZSS-1087 invalidate() make sheet scroll back to top
  ZSS-1089 ZSS doesn't apply searching result when the filter is applied
  ZSS-1092 option (Select All) in autofilter dialog is not correctly shown
  ZSS-1090 External book reference failed
  ZSS-1093 ClassNotFoundException when loading zssjsf
  ZSS-1091 Support customized header and footer
  ZSS-1095 Create new book causes js error
  ZSS-1094 Many Classes do not implement the Serializable Interface and in Cluster mode Fails
  ZSS-1098 PageUp does not stop editing
  ZSS-1096 Invalid named range causes importing failure
  ZSS-1099 Cannot disable moving a sheet left and right
  ZSS-1100 UiException: Illegal request when change sheet
  ZSS-1101 JavaScript NPE
  ZSS-1108 IE only. +90/-90 degree text not showing correctly
  
** Upgrade Notes
  * Set org.zkoss.zss.ui.Spreadsheet#setMaxVisibleRows() to zero or leave as default; then
    ZK Spreadsheet will determine the max visible rows per the sheet's content.
  * Set org.zkoss.zss.ui.Spreadsheet#setMaxVisibleColumns() to zero or leave as default; then
    ZK Spreadsheet will determine the max visible columns per the sheet's content.
  * org.zkoss.zss.ui.Spreadsheet#getCurrentMaxVisibleRows(): new API which returns the max 
	number of visible rows of the currently selected sheet. If you ever used getMaxVisibleRows() or
	getMaxRows() in application should replace with this new API instead.
  * org.zkoss.zss.ui.Spreadsheet#getCurrentMaxVisibleColumns() now API which returns the max 
	number of visible columns of the currently selected sheet. If you ever used getMaxVisibleColumns() or
	getMaxColumns() in application should replace with this new API instead.
  
 ------------
ZK Spreadsheet 3.8.0.1
*Features:
  ZSS-1054 Support bookmark disabled
  
*Bugs:
  ZSS-1052 Shutdown in jetty will cause NPE

** Upgrade Notes

 ------------
ZK Spreadsheet 3.8.0
*Features:
  ZSS-923 Support dirty check for book
  ZSS-872 Support automatically saving the book model periodically
  ZSS-883 Make Format Dialog be customized easier
  ZSS-918 Support to display vertical text
  ZSS-940 Support removing GA code for EE customer version
  ZSS-939 Changing cell style doesn't trigger formula recalculation
  ZSS-945 Optimize calling FormatEngine#format when rendering the Spreadsheet
  ZSS-915 Display the indent text in a cell
  ZSS-901 Improve the filter's usability
  ZSS-942 Support notification at menu bar for automatic data saving
  ZSS-944 Support 90/-90 degree Text orientation
  ZSS-855 Suport import/export Table data model in XLSX file
  ZSS-962 SUBTOTAL function should suport ignore hidden cell for subfunction 101 to 111
  ZSS-958 Auto row height should support for client side calculation
  ZSS-963 Support text indent with toolbar button
  ZSS-960 Support evaluate formula with Table expressions
  ZSS-964 Support text orientation with dialog
  ZSS-966 Support change Table name
  ZSS-967 Support change Table's column name
  ZSS-698 Support validation dialog
  ZSS-977 Support showing Tables
  ZSS-981 Support parameters verification of data validation
  ZSS-985 Support delete a whole Table Row or a whole Table Column.
  ZSS-986 Support insert whole Table row or whole Table column.
  ZSS-989 Support auto-categorization of formulas in Table's Totals Rows.
  ZSS-1002 Support copy table related formula from inside table to outside table and vice versa
  ZSS-973 Hidden rows and columns should not be printed in the exported PDF
  ZSS-974 Export fill pattern to PDF file
  ZSS-975 Export bold text to PDF file
  ZSS-1001 Support clear a Table
  ZSS-988 Support auto filter on Table
  ZSS-982 Add a parameter to show/hide chart when the data source is in hidden columns and rows
  ZSS-1014 Support EOMONTH function
  
*Bugs:
  ZSS-910 Problem referencing a cell with formula in same position of other file
  ZSS-914 java.lang.IndexOutOfBoundsException on HSSFRow.getRowStyle()
  ZSS-916 ZSS doesn't display space character in a cell with wrapped text
  ZSS-917 ZSS doesn't display a long text across cells with background colors
  ZSS-907 Cannot prevent user to add a new sheet
  ZSS-908 Cannot prevent user to rename a sheet with disableUserAction
  ZSS-838 Spreadsheet crashes when using autofilter with large amount of rows
  ZSS-928 Seting fit width and height into one page doesn't print gridline and headings
  ZSS-935 Data filter show error window if the data contains #N/A or #DIV/0
  ZSS-934 Data validations are not visible after switching to another sheet
  ZSS-937 Hiding column and row shouldn't cause js error when switching sheets
  ZSS-938 It shouldn't show tiny part of header's title when hidden column header
  ZSS-924 JS Error showed in console when ZSS in JSF has no excel source file.
  ZSS-933 Server console shows "evaluation stack not empty" when load page
  ZSS-919 Missing top border
  ZSS-920 Unexpected onCtrlKey request is sent to server when using ZSS JSF
  ZSS-936 Friend focus should use new event type instead of model event
  ZSS-943 Turn off filter shouldn't cause NPE
  ZSS-946 Cannot upload a file in zssapp
  ZSS-947 Cannot upload a file with a print area
  ZSS-941 zss.wpd file is loaded even if spreadsheet component is not used  
  ZSS-948 The top border of the first row is incorrectly covered by the column heading.
  ZSS-927 Problem with cell's format after merge cells in frozen column
  ZSS-952 Too many columns with custom width causes incorrectly rendering
  ZSS-954 Filter button does not properly rendered when change selected sheet
  ZSS-953 Filter button does not properly rendered when scroll into view
  ZSS-808 Auto changing height shouldn't be treated as custom value
  ZSS-951 Cell overflow should consider indent case
  ZSS-959 Spreadsheet shouldn't crash when using BaseWidget
  ZSS-956 Zssapp exported Excel filename extension should be xlsx
  ZSS-980 Data validation in range should consider clear case
  ZSS-983 Rename Table then Rename column, the column name in formula inside table should change accordingly
  ZSS-979 Data validation for a whole row or column should work
  ZSS-984 Should not be able to delete the row if the row contains Table Header or across rows of two Tables
  ZSS-970 Zssapp crashed during editing
  ZSS-957 setCellStyle() should not clears a formula result cache
  ZSS-996 Cannot scroll rows when mouse pointer is over freezing columns
  ZSS-990 Should NOT be able to set DataValidation on Table's total Rows
  ZSS-978 Formula parameters in dataValidation shouldn't change valid value
  ZSS-1005 formula editing adds arbitrary cell references
  ZSS-994 Data validation with date should work
  ZSS-1007 Hide rows shouldn't cause java exception
  ZSS-1009 NPE on import
  ZSS-1008 Should show frozen pane
  ZSS-1011 org.zkoss.zss.model.InvalidFormulaException
  ZSS-1012 Should export customHeight on Row with cells
  ZSS-1016 Should not export default style to Row.
  ZSS-1013 Should be able to refer Table of another sheet
  ZSS-1018 Color and decoration of a hyperlink in cell is not correctly displayed
  ZSS-1019 Should not show Filter button if hiddenButton is set to true
  ZSS-1022 NPE when load file with theme
  ZSS-1017 wrap + Indention is not correct rendered
  ZSS-1027 Setting a row background color causes exported xlsx to have every row contains that background color
  ZSS-1035 Should repeat column titles when exporting to PDF
  ZSS-1031 Fail to export a PDF when set repeating rows title
  ZSS-1029 Cells with background color only shows for cells containing data when exporting to PDF
  ZSS-1033 Print headinging in smaller default row height
  ZSS-1030 Exported PDF's cell border shouldn't be broken
  ZSS-1028 Export a blank file throws an IOException
  ZSS-1042 focus() doesn't work as expected
  ZSS-1036 Fail to export a file with repeating row title to a PDF
  ZSS-1041 Linked text should show underline
  ZSS-1040 Focus mark shouldn't be mis-alignment with grid line
  ZSS-1038 Saving file shouldn't cause NPE
  ZSS-1045 Mouse click doesn't work on a focus mark
  ZSS-1043 Friend focus mark does not show in frozen panel
  ZSS-1046 Paste multiple invalid formulas from notepad into cells show infinite warning message
  ZSS-1037 Switching sheet tabs while editing a formula causes unable to enter
  ZSS-1047 Cell text is incorrect after inserting column
  ZSS-1032 Multiple copied Cell case across frozen panel causes js error
  ZSS-1048 Start selection from hyperlink cell should work
  ZSS-1049 When sheet move, the corresponding formula does not update
    
** Upgrade Notes
  * Default period for automatically saving in zssapp is 15 minutes.
  * Zssapp supports saving all in-memory saved book when server is shutting down.
  * org.zkoss.zss.model.SCellStyle.BorderType has been moved to org.zkoss.zss.model.SBorder.BorderType; thus APIs that pass the  BorderType as a parameter will have to be modified accordingly.
  * org.zkoss.zss.model.SCellStyle.FillPattern has been moved to org.zkoss.zss.model.SFill.FillPattern; thus APIs that pass the FillPattern as a parameter will have to be modified accordingly.

 ------------
ZK Spreadsheet 3.7.0
*Features:
  ZSS-815 Enhance performance of dependents and precedents lookup mechanism
  ZSS-814 Provide a new APIs which can enforce evaluation and refresh the specified range.
  ZSS-777 Display currency symbol of different countries
  ZSS-663 Spreadsheet: jump to first/last sheet
  ZSS-832 Support hide sheet
  ZSS-845 Support auto update for Cells refer other cells via INDIRECT() function
  ZSS-697 Enhance the Chart engine
  ZSS-846 Support clearClientCache to avoid bloated client in some cases.
  ZSS-848 Support comment set/get Range APIs
  ZSS-841 Support displaying fill pattern
  ZSS-854 Support import/export DXfs styles in XLSX file
  ZSS-856 Support import/export diagonal border in XLSX file.
  ZSS-849 Support show cell comment
  ZSS-852 Support condition in SUMPRODUCT function
  ZSS-5   Support insert/edit/delete comment
  ZSS-850 Support changing fill pattern with dialog
  ZSS-839 Import temporarily file to edit for zssapp
  ZSS-840 support collaboration for zssapp
  ZSS-869 Provide a share button to share document with a URL
  ZSS-568 Support double border style for cells
  ZSS-873 Import formula cache result from an Excel file
  ZSS-877 Format cell dialog shows "General" to indicate a cell with no specific format selected
  ZSS-876 Show format sample in red for negative number in format cell dialog
  ZSS-879 Format Cell dialog can display current cell's format
  ZSS-878 Support adding custom formats and show them in Format Cell dialog
  ZSS-902 ZSS can throw more specific information when importing fails
  ZSS-897 Zssapp should support alert when close window without saving
  
*Bugs:
  ZSS-820 Formula should change sheet name if reordered sheet goes beyond the formula's sheet boundary.
  ZSS-818 Formula not update outside the preload rows
  ZSS-816 Performance impact when protect sheet with allowSelectingUnlockedCells set to true
  ZSS-811 Exception when export a cell with special formula
  ZSS-812 NPE when evaluate a special formula
  ZSS-829 export pdf cause exception: the region is illegal A47:H48[47,0,46,7]
  ZSS-821 missing chart title after importing a chart
  ZSS-822 The scale of y axis is different after importing a chart
  ZSS-806 Should NOT show Hidden sheet.
  ZSS-843 close book causes NPE
  ZSS-835 if validation type is "any", its Input message will be lost when exporting
  ZSS-831 incorrect clipping at page junction when export to pdf
  ZSS-834 Spreadsheet cannot understand data validation which refers to named range whose name comes from formula
  ZSS-837 Delete a data validation on a cell doesn't remove browser's dropdown list
  ZSS-809 DataValidation does not handle literal list (comma seperated list) correctly
  ZSS-833 Formula in validation's formula field should follow the relative reference rule
  ZSS-847 Spreadsheet changes a correct sum formula to an incorrect one
  ZSS-826 Fail to export to PDF if set chart title font
  ZSS-827 Change PdfExporter print setup's one property but it will lose original Excel print setup
  ZSS-853 A cell applied with text format is still evaluated as a formula
  ZSS-857 Background color in Spreadsheet should be equaled to the BackColor in class CellStyle, not the FillColor.
  ZSS-851 Users cannot type anything after closing a context menu
  ZSS-858 Some sheets are hidden because sheet bar becomes 2 layers
  ZSS-828 reading from xlsx file can't identify stacked grouping and stacked percentage grouping
  ZSS-830 export the imported xlsx file and open it in MS Excel, chart will lose many information.
  ZSS-865 Text in two adjecent cells overlaps
  ZSS-861 Spreadsheet displays an extra focus box on a merged cell
  ZSS-866 Incorrect validation error for a string contains a percentage symbol
  ZSS-881 NPE when render chart with cell format "[DBNum1][$-404]General"
  ZSS-885 Percentage value in tooltip of chart show undefined in IE
  ZSS-884 Resize from almost 0 width of spreadsheet to visible status, column header shouldn't disappear
  ZSS-863 Copy focus mark should be disappear after create new sheet
  ZSS-886 Switching sheet causes JS error
  ZSS-882 Chart should support showing appropriate non-label name data
  ZSS-864 Comment should be shown when multiple cells are selected and mouse cursor is on the commented cell inside selection
  ZSS-891 Cannot export cells with error values
  ZSS-892 An exception is thrown when exporting a file with 0 scale value
  ZSS-896 column width is not correct.
  ZSS-889 Range of selecting a range of Unlock cells doesn't show correctly
  ZSS-862 ZSS charts can't identify the data properly
  ZSS-895 Unable to click the hyperlink within a multi-row merged cell before the cell is focused
  ZSS-899 After saving cell's hyper link doesn't work anymore
  ZSS-900 Desktop removed when click a mailto hyperlink in cell
  ZSS-903 Unable to copy cell content to another application
  
** Upgrade Notes
  * The format of arguments "formula1" and "formula2" in following data validation api has changed:
	* Range.setValidation(
			ValidationType validationType,
			boolean ignoreBlank,
			OperatorType operatorType,
			boolean inCellDropDown,
			String formula1,
			String formula2,
			
			boolean showInput,
			String inputTitle,
			String inputMessage,
			
			boolean showError,
			AlertStyle alertStyle,
			String errorTitle,
			String errorMessage);

	* It is no longer working to input a literal list whose items are delimited with comma and embraced with curly braces(e.g. {item1, item2, item3}). Please input items delimited with comma directly without the embraced curly braces(e.g. "item1, item2, item3").
	* It is no longer working to input a formula without the leading equal sign('='). Please input a formula with a leading equal sign('=') just like you will do in a spreadsheet's cell.
  * Following api are deprecated:
	* SCellStyle.setBackgroundColor(SColor backColor): use SCellStyle.setBackColor(SColor backColor) instead.
  * Chart now uses ZK Charts as default chart engine whose exporting needs extra export server. For more detail, please see "export" section in ZK Spreadsheet Essentials.
  * Enumeration name of CellStyle.FillPattern is changed to comply with Excel's term:
	NO_FILL -> NONE, SOLID_FOREGROUND -> SOLID, FINE_DOTS -> MEDIUM_GRAY, ALT_BARS -> DARK_GRAY, SPARSE_DOTS -> LIGHT_GRAY, THICK_HORZ_BANDS -> DARK_HORIZONTAL, THICK_VERT_BANDS -> DARK_VERTICAL, THICK_BACKWARD_DIAG -> DARK_DOWN, THICK_FORWARD_DIAG -> DARK_UP, BIG_SPOTS -> DARK_GRID, BRICKS -> DARK_TRELLIS, THIN_HORZ_BANDS -> LIGHT_HORIZONTAL, THIN_VERT_BANDS -> LIGHT_VERTICAL, THIN_BACKWARD_DIAG -> LIGHT_DOWN, THIN_FORWARD_DIAG -> LIGHT_UP, SQUARES -> LIGHT_GRID, DIAMONDS -> LIGHT_TRELLIS, GRAY125 -> LESS_DOTS, GRAY0625 -> LEAST_DOTS
  
 ------------
ZK Spreadsheet 3.6.0
*Features:
  ZSS-182 Fire stop editing by up ,down,right or left keys pressing
  ZSS-735 Picture should reuse same PictureData
  ZSS-688 Clone a sheet and add it to the current book
  ZSS-742 Support API for input rich text
  ZSS-725 Provide a richtext editor for inline cell styles
  ZSS-747 Cache formula parsing results
  ZSS-750 Optimize setEditText() to avoid set into the same cell with the same text
  ZSS-759 Optimize evaluation to use the cached Ptg[]
  ZSS-751 Provide a new APIs which refresh the specified range.
  ZSS-760 Provide control to avoid unnecessary auto update on setXxx()
  ZSS-736 Add a new "copy sheet" option on sheet tab context dialog
  ZSS-690 Edit cell with text contains line break, it should apply "wrap-text" to the cell automatically
  ZSS-765 Import/export more printing setup parameters
  ZSS-768 Support horizontal/vertical center-on-page when export to PDF
  ZSS-769 Support print heading when export to PDF
  ZSS-770 Support print repeating column/row titles when export to PDF
  ZSS-771 Support Left-to-Right then Top-to-Bottom paging when export to PDF
  ZSS-772 Support render long text that across Cell boundary when export to PDF
  ZSS-773 Support rendering text in merged cell that across cell boundary when export to PDF
  ZSS-776 Support print double border when export to PDF
  ZSS-775 Support scale page when export to PDF
  ZSS-695 PDF exporter supports to shrink a sheet to fit a page
  ZSS-778 Support print header and footer when export to PDF
  ZSS-789 Support print double underline and account underline when export to PDF.
  
*Bugs:
  ZSS-722 autoFill() with non-VALUE option should not copy value over.
  ZSS-726 Error when typing a locale specific Currency symbol
  ZSS-729 Range.setValidation() with formula doesn't create a drop-down input
  ZSS-728 Rich text format does not apply to the cell when import excel
  ZSS-700 ConcurrentModificationException happened when testing with intensive formula test case
  ZSS-701 NullPointerException happened when testing with collaboration editing test case
  ZSS-739 IllegalStateException when testing with collaboration editing test case
  ZSS-740 IndexOutOfBoundsException when testing with collaboration editing test
  ZSS-737 Can't type Chinese/Korean character correctly
  ZSS-744 Click toolbar button when inline editing does not stop editing in IE
  ZSS-746 Excel complains Security Alert - Office File Validation on exported xls file
  ZSS-748 Cell text can not display as subscript or superscript with rich text format
  ZSS-753 Cannot undo setRichText()
  ZSS-754 The method Range.setValidation() doesn't have annotation @since 3.5.0
  ZSS-752 Failed to apply style to a cell with rich text correctly.
  ZSS-756 Unexpected messagebox showed in the Insert Function Window
  ZSS-743 Possible performance impact due to formula re-evaluation
  ZSS-762 context menu on sheet bar may be closed when we right click on the inactive sheet tab
  ZSS-710 When rename sheet, cannot press "Delete" key to delete a character
  ZSS-755 Press minus key, '-', cannot enter editing mode in a cell under firefox
  ZSS-549 Enlarge a text to exceed its row height, the text will not be exported to PDF
  ZSS-766 freeze panel is not working in IE10
  ZSS-774 Text line space is not consistent with Excel's printouts when export to PDF
  ZSS-529 exporting a sheet to PDF creates odd page breaks
  ZSS-195 When exporting a PDF the defined print areas for workbook pages are not honored.
  ZSS-185 When exporting as a PDF the output of merged cells is incorrect with extra borders displayed within the merged cells
  ZSS-320 Exported PDF file has big difference with original one in the Spreadsheet, when spreadsheet book has pictures
  ZSS-178 Fail to export chart properly to pdf
  ZSS-779 Text clipped when export center-across-selection cells to PDF
  ZSS-780 Cell with background color should not print grid-line when export to PDF
  ZSS-781 ZSS doesn't update formula's cell reference of different sheet after renaming
  ZSS-792 Fail to correctly check legal Name name
  ZSS-790 Cannot handle formulas which refer to Name of the other sheets'
  ZSS-791 General number formatting should consider the merge cell width
  ZSS-795 '?' should be a legal character in defined Name
  ZSS-796 Fail to load book with table formula
  ZSS-797 White background exported to become black background.
  ZSS-798 "The document is not open." exception when export to PDF
  ZSS-799 Row number is clipped if load a spreadsheet whose default row height is greater than 20px
  ZSS-802 Fail to export Sheet with PrintArea.
  ZSS-803 Support resolving formula Name.
  ZSS-804 A Formula Name which should return a Range.
  ZSS-805 Validation dropdown button is not correctly positioned in merged cell
  ZSS-783 rich text should be hidden by other cells when content height is larger than cell's
  ZSS-788 ZK Spreadsheet incompatible with zk-bootstrap
  ZSS-810 Validation formula that evaluated to an AreaEval should list its formatted text.
  
** Upgrade Notes
  * Following api are deprecated
    * void SSheet.removeDataValidationRegion(CellRegion region): Use the new 
      List<SDataValidation> SSheet.deleteDataValidationRegion(CellRegion region) instead.


 ------------
ZK Spreadsheet 3.5.0
*Features:
  ZSS-651 Need to enhance performance for partial evaluation
  ZSS-665 Smart number input handling
  ZSS-666 Smart number "General" formatting
  ZSS-576 Support Excel "Protect Sheet" allowed actions
  ZSS-565 Support input with Swedish locale into formula
  ZSS-685 Do not import duplicate cell style
  ZSS-684 Auto expand editing area's width when editing cell
  ZSS-678 Support creating reference between two sheets
  ZSS-691 Support calculation in Excel's double precision
  ZSS-459 VALUE function support smart input format
  ZSS-702 Fine tune DataValidation to hold multiple regions 
  ZSS-708 Support theme customization
  ZSS-703 Allow user to use use their own PivotTableHelper implementation
  ZSS-713 Make a modern design theme as default
  ZSS-714 When in collaboration edit, hover on other editor's current selection will show its name
 
*Bugs:
  ZSS-652 Cut Formula shouldn't be shifted when it is not in cut range
  ZSS-655 Formula that contains Name doesn't update
  ZSS-654 if I directly right click on different cell in IE 8 and 9, the context menu often close automatically
  ZSS-644 Fail to export to XLSX format when the book has a hyperlink with invalid URI
  ZSS-645 Fail to export to XLS format when the book has a named range referring to an external book
  ZSS-294 cannot create a named range
  ZSS-658 Right click on cell only show style menupopup
  ZSS-661 Formula is incorrect after rename Name or it's refersTo region.
  ZSS-641 Desktop not found if I submit the form.
  ZSS-662 Paste large text into a cell, visible area of the worksheet moves to the left
  ZSS-672 Input #NAME? shall be deemed as an Error value
  ZSS-656 Copy-paste from clipboard to ZSS not working for Mac OS
  ZSS-674 Edit a cell but do not leave, hit save, changes not saved
  ZSS-670 A dot is replaced with colon in a formula causes exported Excel file corruption under German (Polish) locale
  ZSS-562 IllegalArgumentException showed when referencing a Spring bean that contains List type properties
  ZSS-664 page down/up move by page size, not 100 rows
  ZSS-679 Edit objects option in sheet protection is inconsistent when save to excel
  ZSS-680 ZSS App always save to xlsx format.
  ZSS-677 AbstractExcelImporter doesn't reuse imported font
  ZSS-683 Enter formula with bad syntax, would cause infinite error message window
  ZSS-661 Formula is incorrect after rename Name or it's refersTo region.
  ZSS-649 After delete row, NameRange doesn't update
  ZSS-687 Formula that refer to a NameRange does not update contents correctly
  ZSS-514 if the font size is larger than 24, the text will overlap each other when using inline editor
  ZSS-609 The input text box doesn't disappear when rename sheet bar with empty name and click another sheet
  ZSS-648 Validation position doesn't shift up when delete rows shift up
  ZSS-681 Open context menu and press tab, the upper style panel should close
  ZSS-692 Label may be mismatched in ClearCellHandler class
  ZSS-693 Sorting should shift formula accordingly
  ZSS-694 The Validation of a Cell should be pasted to the new range accordingly.
  ZSS-696 Cut a single cell and Paste to a merged cell should unmerge the merged cell and paste to the left-top cell of the original merged cell
  ZSS-675 Context menu does not close when left click inside the selection
  ZSS-646 Apply filter incorrectly when contained merged cells
  ZSS-704 Add one more value in the bottom cell of an autofilter column, press button does not list the new value
  ZSS-705 Failed on handle the case when merged cells are in the top row of AutoFilter
  ZSS-556 Scroll then change sheet, make autofilter disappear
  ZSS-706 Open context menu, click between style popup and menu popop, the style popup does not close
  ZSS-555 Insert a row on the row with autofilter cause double autofilter
  ZSS-707 The sorting order of AutoFilter dropdown is not correct.
  ZSS-689 Edit cell formula and use mouse to select a merged cell, it will insert range
  ZSS-579 Undo doesn't notify toolbar button to change status
  ZSS-632 mailto link should not appear in web address textbox in "Insert Hyperlink" dialog
  ZSS-578 Insert a picture at Range(0,0) and drag it left or top will cause null pointer exception
  ZSS-699 Crash with medium xlsx file
  ZSS-715 InvalidFormulaException while importing an XLS file with formula in pt_BR Locale
  ZSS-716 Insert function which takes no arguments by "Insert Function" dialog will get wrong formula
  ZSS-719 Insert bad formula may show unexpected error message
  
** Upgrade Notes
  * Following api are deprecated
    * Range.protectSheet(String password): Use the new 
      Range.protectSheet(String password,  
        boolean allowSelectingLockedCells, boolean allowSelectingUnlockedCells,  
        boolean allowFormattingCells, boolean allowFormattingColumns, boolean allowFormattingRows, 
        boolean allowInsertColumns, boolean allowInsertRows, boolean allowInsertingHyperlinks,
        boolean allowDeletingColumns, boolean allowDeletingRows, 
        boolean allowSorting, boolean allowFiltering, boolean allowUsingPivotTables, 
        boolean drawingObjects, boolean scenarios) 
        
      API instead to protect the sheet with more protection options; use the new
      Range.unprotectSheet(String password) to unprotect the sheet; use the new
      Range.getSheetProtection() to tell the current protection options.
    * Customized theme can be registered using SpreadsheetThemes.register(themeName, displayName, priority) 
      API. The user could switch to any registered themes by setting 'zsstheme=default' in cookie or
      library property:
      <library-property>
        <name>org.zkoss.zss.theme.preferred</name>
        <value>default</value>
      </library-property>

 ------------
ZK Spreadsheet 3.5.0 RC
*Features:
  ZSS-606 Support to handle multiple-area formula
  ZSS-623 Support handling row/column style
  ZSS-634 Support chart and picture operation for XLS format
  
*Bugs:
  ZSS-350 When using cell validation with cell list, the drop-down list won't update after the referred cells changed
  ZSS-581 Formula lost to update after rename 2 sheet
  ZSS-583 NullPointerException when the sheet has hyperlinks with empty URL
  ZSS-582 Can't display chart after rename the sheet name to dot(.)
  ZSS-587 wrong gridline display after delete column
  ZSS-588 get exception when import xls
  ZSS-590 Chart shows to another sheet after delete sheet
  ZSS-591 Get console exception after delete sheet
  ZSS-593 Spreadsheet doesn't be released immediately after close tab in collaboration
  ZSS-594 wrong display when insert/delete row/column in freeze column/row panel
  ZSS-596 Possible memory leak when formula evaluation
  ZSS-598 Cell doesn't display correctly
  ZSS-585 Java SE 5 Compliance
  ZSS-577 Can't display chart correctly
  ZSS-601 Once I use right click context menu on sheet bar, it will never work again
  ZSS-605 Spreadsheet doesn't fit in screen with hflex, vflex is 1 and show scroll bar
  ZSS-602 Horizontal alignment dropdown in context menu doesn't show any items after one click on it
  ZSS-603 Color dropdown in context menu displays incorrectly after I click it one time
  ZSS-604 After change cell alignment twice times will cause right click event doesn't show context menu
  ZSS-610 Can't get correct book type.
  ZSS-613 Duplicated Event-Queue Event when set sharescope to application
  ZSS-618 Bad performance when setting hug among of data in collaboration mode
  ZSS-619 Wrong evaluation result after insert/delete
  ZSS-620 Large response data when update a big region with same style
  ZSS-600 First time right click shows empty context menu
  ZSS-589 Hidden rows are still displayed in IE
  ZSS-617 After spreadsheet loads a book, a mask is blocking the sheet
  ZSS-612 Cannot sort files name value in ZSS app "Open Book Dialog"
  ZSS-616 Selection box is displayed at wrong position
  ZSS-592 Insert row/column on freeze panel with Range API is a illegal operation but doesn't get any information from server and cause js error
  ZSS-595 Perform insert row operation on rows cover freezed row and non-freezed row will cause js error
  ZSS-608 Copy a single cell to a merge cell cause unexpected result
  ZSS-622 Spreadsheet toolbar function not work correctly if creating the instance at runtime
  ZSS-626 Formula result is not correct after insert/delete cells
  ZSS-627 Paste format doesn't work
  ZSS-633 Importer doesn't import custom column width for XLS format
  ZSS-635 Set row height or column width with empty value will cause NPE
  ZSS-636 Insert a chart with all blank cells, but the chart contains value
  ZSS-639 a formula refer to one cell at other sheet with freeze panel. change the refered cell cause JS error
  ZSS-640 cells with formula in freeze panels didn't be update after changing refered cells
  ZSS-637 Cannot export XLS format
  ZSS-631 Cannot drag fill with merge cell
  ZSS-643 Wrong cell value and display after undo
  ZSS-642 Spreadsheet throws an exception when exporting PDF with charts
  ZSS-630 when setting font style via context menu, first click doesn't work
  ZSS-586 Select all then insert row cause javascript error (insert column work fines)
  ZSS-553 "clear style" and "clear all" can unmerge cells, but undo can't merge them back
  ZSS-481 Undo doesn't work correctly when delete a row with merged cell
  
** Upgrade Notes
  * Following api are removed
    * Book.getPoiBook() : you can't get any poi model object from this verion, instead of you get internal book model by getInternalBook()
    * Sheet.getPoiSheet() : get the internal sheet by getInternalSheet()
    * ChartData getPoiChartData() : get the internal chart data by getInternalChartData();

  * Following api are changed
    * addChart() : It will add the chart directly from the selected area/data in the range
    * CellSelectionType is moved from org.zkoss.zss.ui.event to org.zkoss.zss.ui

  * Following api are deprecated
    * Range.SyncLevel and Range.setSyncLevel() :  It is always synchronized on Book by a read-write lock.  
    * Book.getSync() : we use a new ReadWriteSync, you can get the lock by getLock()  
    * CellStyle.getBackgroundColor() : use getFillColor()
    * EditableCellStyle.setBackgroundColor : use setFillColor()
    * Exporter.export(Sheet sheet, OutputStream fos) and export(Sheet sheet,AreaRef selection,OutputStream fos)


 ------------
ZK Spreadsheet 3.0.2
*Features:
  
  
*Bugs:
  ZSS-541 date autofill timestamp is incorrect
  ZSS-547 Sheet index (31) is out of range (0..30) error when deleting sheets in a workbook
  ZSS-569 Range.notifyChange can't update formula value
  ZSS-593 Spreadsheet doesn't be released immediately after close tab in collaboration
  ZSS-596 Possible memory leak when formula evaluation
  ZSS-585 Java SE 5 Compliance
  ZSS-589 Hidden rows are still displayed in IE
  ZSS-617 After spreadsheet loads a book, a mask is blocking the sheet
  ZSS-612 Cannot sort files name value in ZSS app "Open Book Dialog"
  ZSS-616 Selection box is displayed at wrong position
  ZSS-622 Spreadsheet toolbar function not work correctly if creating the instance at runtime
  ZSS-621 Delete the cell with a shared formula and export, spreadsheet cannot load the file back correctly
  ZSS-624 Copy a row on top of itself, get an error
  
** Upgrade Notes
  

 ------------
ZK Spreadsheet 3.0.1
*Features:
  ZSS-511 LEFTB and REPLACEB return #NAME
  ZSS-527 Enter formula with bad syntax, would like "bad" formula to remain in cell
  ZSS-537 Spreadsheet supports Internet Explorer 11
  ZSS-544 Support ignore row break and column break when export PDF
  ZSS-475 Select shift and down arrow, scroll the screen automatically
  
*Bugs:
  ZSS-510 ApplyDataFormat with "" then getCellFormatText from range will cause IndexOutOfBoundaryException and spreadsheet crash.
  ZSS-515 Delete freeze row then insert a row causes javascript exception
  ZSS-509 Protecting only selected rows or columns protect ALL empty cells
  ZSS-519 Do not display background color of empty cells
  ZSS-524 After change chart font library setting, the chart without title throws NPE.
  ZSS-517 Apply background works strangely
  ZSS-523 misleading error message for text formulas
  ZSS-520 Rapid typing causes error in spreadsheet
  ZSS-512 when performing "clear style" on merged range can unmerge it, but "clear all" doesn't
  ZSS-538 Ctrl+u doesn't apply underline to a cell
  ZSS-534 font size not displayed properly in toolbar
  ZSS-536 Type on a cell something get empty result
  ZSS-533 formula's function with non-existed name should be resolved to #NAME? and an name be created in file
  ZSS-513 inline editor is at wrong position when re-edit cell with validation
  ZSS-205 scroll bar in function bar is not persistent
  ZSS-528 Unwrapping text in a cell does not resize cell
  ZSS-561 Closing a book than open a book, the cell will become chaos when using IE 10 and IE 11
  
** Upgrade Notes
  * Members of BookType of Book are changed from EXCEL_2003,EXCEL_2007 to XLS,XLSX because of Spreadsheet depends on file format not Excel version.

 ------------
ZK Spreadsheet 3.0.0
*Features:
  ZSS-438 Support view with different zoom level
  ZSS-251 Support to override the default formula implementation
  ZSS-10 Support to display chart/picture in freeze panel
  ZSS-463 support configurable font color popup
  
*Bugs:
  ZSS-399 export to PDF - no gridlines
  ZSS-420 Cannot focus on cell when set rowfreeze="0" or columnfreeze="0"
  ZSS-421 Cannot open inline editor when use rowfreeze or columnfreeze
  ZSS-439 Delete rows cause XmlValueDisconnectedException
  ZSS-392 Freezing panes with preload attribute cause cell data not render
  ZSS-423 JS error when rowfreeze > preloadRowSize or columnfreeze > preloadColumnSize
  ZSS-376 throw exception when drawing unsupported chart in xls format
  ZSS-369 throw exception when rendering line chart with non-contiguous series data in xls format
  ZSS-412 Cell layout crash after cut overlap on merge cell after undo
  ZSS-433 adjust column width and javascript errors showed
  ZSS-432 after insert new sheet and export it, then input some data into this new sheet and export again. such file can't load by ZSS and Excel
  ZSS-431 if freeze the specific xlsx file and export it, its freeze position is wrong in Excel
  ZSS-418 if two or more cell with comment in a row and shift them, the exported file will make Excel occur error when loading
  ZSS-378 ZK spreadsheet selected cell can type in English but can not input Chinese
  ZSS-434 insert,delete whole column or row when overlap merge cell will cause unexpect result
  ZSS-446 border patterns around a cell it is not showing in the exported pdf file
  ZSS-219 Problem with org.zkoss.zss.ui.Spreadsheet.focusTo
  ZSS-447 Date format and display doesn't match
  ZSS-214 NPE when I try to rename sheet
  ZSS-256 hidden column is not hiding when displaying a excel file
  ZSS-313 after several switching sheets and resize row height, cells frame become a mess
  ZSS-272 when spreadsheet displays an Excel 2003 file that contains "conditional formatting" setting, it crashed and cannot render anything
  ZSS-428 occur exception when switching sheet with specific xlsx file
  ZSS-440 IE10 resizing column (java.lang.Double cannot be cast to java.lang.Integer)
  ZSS-441 Wrong sum results
  ZSS-404 JS Error after insert column when freeze
  ZSS-443 change width of columns in corner freeze panel will cause Javascript exception
  ZSS-449 Freeze panels and change row/column size, then switch to other sheet and back, freeze panel's headers will be chaos.
  ZSS-233 hyperlink event doesn't work
  ZSS-348 onHyperlink event of Spreadsheet isn't fired
  ZSS-400 Hyperlink doesn't be shift after insert or delete
  ZSS-451 delete one column at most right and bottom position and scroll up will cause JavaScript exception
  ZSS-242 set max rows dynamically doesn't work
  ZSS-270 error evaluating some statistical formulas
  ZSS-271 evaluation result of some engineering formulas are slightly different from expected
  ZSS-453 NullPointerException when the sheet has hyperlinks with empty URL
  ZSS-455 Chart/Image doesn't move location after change column/row width/height
  ZSS-312 A picture (or chart) should not be allowed to move out of the cell area's top and bottom border
  ZSS-458 Strange behavior when re-sizing North or West of chart/image in scrolling
  ZSS-311 When you move a chart, it should become selected  
  ZSS-452 Inserting a row at non-selected sheet with API doesn't work
  ZSS-252 A Javascript error thrown when right clicking spreadsheet without showing toolbar
  ZSS-280 reapply autofilter doesn't filter newly added the data
  ZSS-299 after applying 2nd filter, the second one should only contain non-filtered data for selection
  ZSS-450 After scrolling down to bottom of sheet quickly, insert a row on a row with data and delete a row, the last row's cells will have data and same as selected row
  ZSS-456 hasMergedCell API doesn't work correctly
  ZSS-454 Cannot click on hyperlink in the merge cell.
  ZSS-231 get wrong row,column in onCellClick if I click on merged cells
  ZSS-222 AutoFitler doesn't work correctly when selecting have some empty cell
  ZSS-427 occur exception when exporting specific xlsx file to PDF
  ZSS-330 hide merged cell's left-top column/row will cause text disappear
  ZSS-382 If hide columns and overlap partial merged cell, cells' alignment will be chaos
  ZSS-448 Filter popup menu is scrolled if setFreezePanel() and unfrozen region is also scrolled
  ZSS-461 Get exception when evaluating hyperlink after export & clear cell
  ZSS-322 Cannot remove a hyperlink
  ZSS-457 Insert a hyperlink on a cell with empty hyperlink doesn't work as expected
  ZSS-296 "Protect Sheet" doesn't prevents cells from using auto filter
  ZSS-202 Cannot display chart title correctly
  ZSS-416 No all border color could apply to cell in 2003
  ZSS-379 The cell's has weird text when using time format in Chinese environment
  ZSS-370 Click cell multiple times, cell turn into gray and cannot edit the cell
  ZSS-380 When input wrong formula, the formula bar will change to below cell and "Enter" key can't blur it
  ZSS-464 Other styles are changed (background color, font size) when just changing cell border
  ZSS-288 email address, https://, ftp:// don't convert to a hyperlink automatically
  ZSS-472 Formula result doesn't change after named-range updated
  ZSS-470 "Blanks" in Autofilter drop-down list never shows checked
  ZSS-471 Multiple filters doesn't work correctly
  ZSS-473 get exception if renamed sheet contains '(' or ')'
  ZSS-468 The color picker in context(popup) menu disappeared if didn't select any color and re-open context menu
  ZSS-462 Can't copy all selected cells to other application when using Chrome
  ZSS-479 Missing left border color when copying a cell
  ZSS-482 Rename sheet with character "." on specific Excel file will cause exception
  ZSS-477 Set outline border around a merged cell doesn't get correct result
  ZSS-485 Paste multiple rows and their order is different from original rows
  ZSS-488 After undoing a deleted column under frozen rows, gridline is in disorder
  ZSS-483 Toolbar button's status doesn't update after switching sheets
  ZSS-490 move a sheet with chart causes an exception
  ZSS-476 Image width becomes very small after exporting
  ZSS-492 If reorder a sheet and modify a cell on it, the value of formula referred to such cell will be incorrect.
  ZSS-230 js loading dependence is not correct
  ZSS-232 onCellClick doesn't fire again if the cell has focus
  ZSS-234 No way to cancel copy highlight rect
  ZSS-249 Overflow not work correctly
  ZSS-250 Doesn't handle well if I delete the sheet from outside button
  ZSS-495 Can't get correct edit text if set a cell value by Date
  ZSS-497 Get wrong cell format text after click reset in jsf/jsp demo
  ZSS-496 Opening "Insert Picture" dialog twice causes whole Spreadsheet disabled
  ZSS-225 protect sheet icon doesn't display correctly if no sheetBar
  ZSS-494 If using xls format and reorder sheet, the sheet reference in formulas will be modified
  ZSS-491 change column width and JS errors show
  ZSS-498 Formula Edit throws RunTimeException
  ZSS-501 Click check mark of formula bar after entering a value, all cells become unable to edit
  ZSS-499 Insert rows above cells where the chart header references will cause NPE
  ZSS-506 After deleting a sheet, the charts which reference the deleted sheet cause an exception
  ZSS-505 delete the last sheet, chart on another sheet show in the last sheet.
  ZSS-500 After hiding a row contained overflow cells, the hidden row's cell text is still shown and overlap
  ZSS-504 hide all column and all row only can recover by undo (not by drag UI)

  
** Upgrade Notes
  * For the fix of ZSS-464, interface of CellStyleApplier(of CellOperationUtil) was simplified and FontStyleApplier was removed (replace by CellStyleApplier directly). If you still need the visit logic of this utility, please refer to original implementation at github (https://github.com/zkoss/zkspreadsheet/blob/e7b51d029fbc6462b1b071603531efb64b26b1c4/zss/src/org/zkoss/zss/api/CellOperationUtil.java).


 ------------
ZK Spreadsheet 3.0.0 RC
*Features:
  ZSS-338 When share book, could the friend focus shows user name of another editor
  ZSS-353 Support head tag in JSP/JSF
  ZSS-388 Support to freeze row of column of sheet
  ZSS-394 Support undo/redo of cell operation
  ZSS-396 provide an API to cut and paste cells at once

*Bugs:
  ZSS-224 text overflow doesn't work correctly
  ZSS-268 get exception if I listen to onValidateDrop
  ZSS-304 hiding columns doesn't work
  ZSS-229 Only the last picture can be moved
  ZSS-325 Cannot copy an area of cells from Excel to Spreadsheet
  ZSS-275 Range.getRow() return unexpected row number
  ZSS-327 server-side paste data will be replaced by client-side paste
  ZSS-310 Rename a sheet to its original should not show up a error message
  ZSS-292 left click row header (or column header) appears context menu
  ZSS-324 Hiding all columns causes non-stopping AU and columns cannot be unhided
  ZSS-291 sorting a group of number with style causes null pointer exception
  ZSS-333 Preload bug
  ZSS-332 Chart was moved if I move another chart in different book in different spareadsheet in same desktop
  ZSS-334 A book can't reset to another book-series
  ZSS-335 When share book, the friend focus color was always change when I switch tab
  ZSS-343 ActiveRangeHelper caches sheet object and doesn't release after reload a book
  ZSS-308 when renaming a sheet, if you click another sheet, the original sheet won't be renamed
  ZSS-255 "data validation" setting causes null pointer exception
  ZSS-351 The validation dialog can't press "yes" button to force input a invalid text when using list validation
  ZSS-254 some "accounting" data format causes NullPointerException
  ZSS-352 Can't set share scope of a book if it is not in zk execution.
  ZSS-317 When importing a xlsx file with images exported from Spreadsheet 2nd time, an exception is thrown
  ZSS-246 Exception when toggle auto filter
  ZSS-259 merges cells have missing bottom border when displaying a excel file
  ZSS-245 Exception when delete columns
  ZSS-326 Insert a chart after deleting first chart causes an exception
  ZSS-349 When adding a chart, if selected cells contains errors, spreadsheet throw a runtime exception
  ZSS-367 Attribute "ctrlKeys" doesn't work
  ZSS-257 unsupported charts cause spreadsheet crash
  ZSS-140 Sheet with XYModel chart throw NullPointerException (xls format)
  ZSS-137 Sheet with chart throw NullPointerException (xls format)
  ZSS-300 When pasting range overlaps copying range, pasting works incorrectly
  ZSS-113 delete sheet's chart cause NPE, xls format only
  ZSS-286 Focused Cell is getting completely white in IE10
  ZSS-383 In IE browser, pop-up format dialog (right click on cell) can't be operated.
  ZSS-302 some rows can only be deleted with twice deletion
  ZSS-260 Data validation doesn't work correctly
  ZSS-387 get js error when resize row height with row freeze
  ZSS-315 paste a text on a merged cell will make the cell unmerged
  ZSS-277 paste a horizontal merged cell in transpose doesn't become a vertical merged cell
  ZSS-390 browser took long time without response if I use freeze panel when select whole row or whole column
  ZSS-389 Shift cell up doesn't work correctly
  ZSS-386 Inserting a picture after deleting first picture causes an exception
  ZSS-331 select all cell has poor performance even not many cells
  ZSS-391 Filter popup menu is hidden by freeze column
  ZSS-354 delete the first column of merged cell and alignment of cells will be chaos
  ZSS-393 Sheet out of sync after cut to different sheet
  ZSS-290 after merging and unmerging cells, input and style both work incorrect
  ZSS-395 Unmerge cell operation doesn't work when the selected range overlap part of merged range.
  ZSS-298 perform "clear style" on a merged cell doesn't split it back to original unmerged cells.
  ZSS-301 cut a merged cell and paste to another cell, the original cell doesn't become unmerged cells.
  ZSS-398 Sheetbar protectSheet menuitem check state is not correct
  ZSS-397 Once deleting a picture on xlsx format, the exported xlsx file cannot be load by Excel or pictures are incorrect.
  ZSS-358 Exported Excel 2007 file with charts cannot be read by Excel 2007
  ZSS-406 Spreadsheet doesn't be release when use application share scope
  ZSS-407 Shouldn't allow to drag row/column size in protected sheet
  ZSS-357 if a file contains #REF! cells, it will throw a exception and can't be rendered when importing such file
  ZSS-410 Undo style action get NPE in 2003
  ZSS-415 Get Exception after save and load a sheet that has comment in 2003
  ZSS-408 Cannot save 2003 format if the file contains auto filter configuration.
  ZSS-414 get NPE when paste from client text
  ZSS-409 Set font color doesn't work in 2003
  ZSS-419 if delete two or more rows at once, the exported file will make Excel error when loading
  ZSS-235 Typo, in toolbar there is 'Outsizde Borders'
  ZSS-237 Exception if rename to same sheet name.
  ZSS-261 Math formula SERIESSUM evaluating error
  ZSS-265 some Info formulas are not found
  ZSS-266 Info formula "ISERR" is evaluated to a wrong result
  ZSS-267 error evaluating some date formulas
  ZSS-269 error evaluating some financial formulas
  ZSS-293 vertical merged cells must be selected by clicking first cell
  ZSS-296 Protect Sheet" doesn't prevents cells from using auto filter
  ZSS-307 move sheet left should not move to first sheet
  ZSS-314 The dependency "commons-io" is not configured in ZSS
  ZSS-264 Some text formula are not found
  ZSS-310 Rename a sheet to its original should not show up a error message
  ZSS-318 A Zsshtml project's resource file (excelStyle.css) is not included in compiled result
  ZSS-321 Unsupported formulas cause an exception and crashed
  ZSS-341 2 statistical formulas throw NotImplementedException
  ZSS-342 When a ZK defined formula has missing required arguments, it throws NotImplementedException
  ZSS-355 When given start date is later than end date In NETWORKDAYS(), it returns #NAME?
  ZSS-409 Set font color doesn't work in 2003
  ZSS-414 get NPE when paste from client text
  ZSS-253 click component away from Spreadsheet but keeps focus
  ZSS-425 Can't update style when save twice
  ZSS-424 get exception when undo after save
  ZSS-426 Endless loop when export demo swineFlu.xls pdf
  ZSS-241 wrap text does not wrap text like excel

** Upgrade Notes
  * Classes inside 'org.zkoss.zss.model' is duplicated and removed, please use the new classes & api
    that inside 'org.zkoss.zss.api' & 'org.zkoss.zss.api.model'
  * Spreadsheet Api changes:
    * get/set Book/Sheet API use the new classes of Book & Sheet that inside 'org.zkoss.zss.api.model'
    * get/set rowfreeze and columnfreeze are deprecated, use Sheet#getColumnFreeze(),Sheet#getRowFreeze() and Range#setFreezePanel(int, int)
  * Rect and Position (in org.zkoss.zss.ui) are deprecated, please use CellRef and AreaRef instead (in org.zkoss.zss.api) 
  * Action, ActionHandler are removed. To override a default action, use AuxAction, UserActionManager instead.
  * Constructor of CellSelectionEvent is changed from left,top,right,bottom to topRow,leftCol,bottomRow,rightColumn
  * SelectionChangeEvent is renamed to CellSelectionUpdateEvent and arguments sequence is also redefined.
  * HeaderEvent is renamed to HeaderUpdateEvent
  * SheetCreateEvent, SheetSelectedEvent and SheetUpdateEvent are removed, use SheetEvent instead.
  * FilterMouseEvent is renamed to CellFilterEvent
  * HyperlinkEvent is renamed to CellHyperlinkEvent
  * Event name change:
    onValidateDrop > onCellValidator
    onFilter > onCellFilter
    onHeaderSize > onHeaderUpdate
    onSelectionChange > onCellSelectionChange
	  onCellFocused > onCellFocus
  * Event name change:
    onSheetNameChange > onAfterSheetNameChange
    onSheetOrderChange > onAfterSheetOrderChange
    onSheetDelete > onAfterSheetDelete
    onSheetCreate > onAfterSheetCreate
    onCellChange > onAfterCellChange
  * JSF
    Main package is renamed to org.zkoss.zss.jsf, Component is renamed to JSFSpreadsheet
  * JSP
    Main package is renamed to org.zkoss.zss.jsp


	------------
ZK Spreadsheet 2.6.0
*Features:
	ZSS-187 Better support for CellStyles while setBorders

*Bug
	ZSS-171 Input "=" on cell shall not append cell reference
	ZSS-177 Resizing the browser wraps the toolbar but the overflow goes under the formula bar
	ZSS-179 spreadsheet exception :XmlValueDisconnectedException
	ZSS-181 on_ctrl_keys (#up#down$#home$#down^#up^#down^#right^#leftt) not works with zk spreadsheet
	ZSS-183 Cannot enable save button when using collaboration Edit
	ZSS-184 Merge and Center in Demo Site (as well as ours) is sporadically unclickable
	ZSS-188 onHeaderClick not work
  ZSS-189 PDF export throws Color 'auto_color' not found exception
  ZSS-196 Data validation list source cannot refer to different sheet's value
  ZSS-197 Data Validation shall not show dropdown button when data source is not list
  ZSS-198 Data validation's message shall auto-disappear when focus on other cell
  ZSS-199 Select a row and apply filter doesn't work well
  ZSS-204 cell context menu covers text formatting menu for cells in lower part of the screen
  ZSS-207 Date validation button not show on first focus
  ZSS-209 NullPointerException when set spreadsheet book in a loop
  ZSS-210 CellStyle.cloneStyleFrom not work when copy cell style from different book
  ZSS-213 Protection doesn't work with drag fill & copy-paste
  ZSS-212 Missing characters when export to PDF
  ZSS-216 Disable button cause the button expand
  ZSS-217 Javascript error with ZK 6.5.1.1 version
  ZSS-218 get NotImplementedException exception  
  ZSS-220 Can't get correct selection if I didn't listen to onCellSelection

ZK Spreadsheet 2.5.0
*Features:   
	ZSS-124 Support import pivot table API
	ZSS-128 Support export pivot table API
	
*Bug
	ZSS-125 Zk Spreedsheet performances problem with an excel file generated with jexcel
	ZSS-126 ZKS performances problem with an excel file generated AND FORMATTED with Apache POI
 	ZSS-127 Cannot open a popup/modal window including ZSS with IllegalStateException
	ZSS-131 Sheets contains unsupported drawing object cannot opening, get null pointer exception
	ZSS-134 Sheets contains unsupported cell format, cannot opening, get null pointer exception
	ZSS-132 Export to PDF on a sheet get null pointer exception
  	ZSS-136 Export to PDF with image, the same image will repeat on each page (when using portrait)
	ZSS-138 Initiate book with property cause NullPointerException
	ZSS-141 Export sheet to PDF doesn't show last column
	ZSS-142 Invalid format cause NullPointerException
	ZSS-143 Cell addres gets into cell value on user input
	ZSS-145	Freezing a row causes the rows above the frozen row to be unselectable.	
  	ZSS-147 Exporting to pdf throws NullPointerException
	ZSS-148 Open sheet with chart without label cause exception
	ZSS-149 DateValue does not reconize Leap day
	ZSS-150 The row/column header size is not correct on Firefox
	ZSS-152 Set new cell text with wrap text, should change row height accordingly
	ZSS-154 Cannot delete the first row, throw IllegalArgumentException
	ZSS-153 After adding a user defined function to a sheet the application throws a NPE inserting/deleting rows/columns/cells
	ZSS-155 Spreadsheet's color button doesn't work with ZK 6.5
	ZSS-156 Insert a image first, then insert a chart, delete the chart cause NullPointerException
	ZSS-157 With frozen area, contiguous scrolling down, cells may missing
	ZSS-158 Second sheet doesn't update cell value
	ZSS-159 Cell with overflow shall has right border when text total width is smaller then cell width
	ZSS-160 Formula button in toolbar is missing
	ZSS-161 Cancel edit button on formula bar not working
	ZSS-162 Insert columns, then scroll down, cell width is wrong
	ZSS-163 In protected sheet, shall not allow user to delete or move chart
	ZSS-164 Mouse click on chart widget, the sheet will move up, chrome only
	ZSS-166 Insert columns, then switch sheet cause wrong cell content
	ZSS-167 Delete rows, then switch sheet, cause cells missing
	ZSS-168 Color button shall close when close when mouse click on cell or other button
	ZSS-169 Copy/Paste sometimes not work correctly
	ZSS-170 Insert row at certain row not work correctly
	ZSS-171 Input "=" on cell shall not append cell reference
	ZSS-172 Edit cell formula and use mouse to select cell, press enter cause wrong cell selection
	ZSS-173 Set row freeze and column freeze, scroll down, cause JS error
	
	------------
ZK Spreadsheet 2.3.0
*Features:   
   ZSS-85 Range support createSheet API that supports collaboration
   ZSS-86 Range support setSheetName API that supports collaboration
   ZSS-87 Range support setSheetOrder API that supports collaboration
   ZSS-97 Spreadsheet support row/column/cell context menu
   ZSS-98 Spreadsheet support toolbar
   ZSS-99 Spreadsheet support sheetbar
   ZSS-100 Spreadsheet support sheet cache
   ZSS-104 ZPOI upgrade to POI 3.8 - Final

*Bug
   ZSS-80 Press ESC cannot cancel editing when formula bar is hidden.
   ZSS-81 Cannot input formula with proper external book name
   ZSS-82 Exception when user input an inexisting book or sheet in formula
   ZSS-83 Drag header not able to hide, unhide
   ZSS-84 Validation button doesn't show after row 20
   ZSS-88 Merge and wrap cell shall not change row height
   ZSS-89 AutoFilter not work correctly on sheet first load
   ZSS-91 zssjsf.jar not work with GlassFish
   ZSS-92 hide column/row by menu, and unhide it by drag doesn't work
   ZSS-93 paste all expect border shall not set paste destination border to empty
   ZSS-94 set sheet name twice throw exception
   ZSS-95 wrap cell cause cell border invisible
   ZSS-96 inline editor shall not input cell ref when click a cell
   ZSS-103 SLN function throws NotImplementedException
   ZSS-109 scroll sheet down and drag widget, the drag view's position is wrong
   ZSS-110 move chart will cause NPE when using xls format file
   ZSS-107 area/scatter chart not show chart content
   ZSS-112 set book that contains chart, switch sheet not show chart correctly
   ZSS-113 delete sheet's chart cause NPE, xls format only
   ZSS-116 export sheet with chart cause Exception (xls format only)
   ZSS-120 insert new row not work well
   ZSS-122 Cell editing is blocked with regular expression check in Japanese locale
   ZSS-123 zssapp insert image cause exception, xls format only
   
	------------
ZK Spreadsheet 2.2.0
*Features:
   ZSS-01 Support validation dropdown list
   ZSS-13 Support Open hyperlink in a separate browser tab window
   ZSS-26 Need css running in zk.wcs not css.dsp
   ZSS-41 Support showing more charts: area, stacked area, scatter, bubble, stacked bar, stacked bar3d in 2007 file format(.xlsx)
   ZSS-44 Support API to add a new chart in 2007 file format(.xlsx)
   ZSS-45 Support API to add a new picture in 2007 file format(.xlsx)
   ZSS-46 Support API to delete an existing picture in 2007 file format(.xlsx)
   ZSS-47 Support API to move an existing picture in 2007 file format(.xlsx)
   ZSS-48 Support API to move an existing chart in 2007 file format(.xlsx)
   ZSS-49 ZSS Spreadsheet App shall support insert chart dynamically
   ZSS-50 ZSS Spreadsheet App shall support insert image dynamically
   ZSS-51 Support API to delete an existing chart in 2007 file format(.xlsx)
   ZSS-54 Chart/Image widget shall be able to move, sizing and delete
   ZSS-55 Auto filter dialog support search function
   ZSS-58 Support collaboration editing with color cell selection focus box
   ZSS-59 Formula editor support cancel button and apply button
   ZSS-60 Editing formula support use mouse to select a cell or a selection
   ZSS-62 ZPOI upgrade to POI 3.8 beta5
   ZSS-64 ZK Spreadsheet App shall support sheet deletion collaboration
   ZSS-66 POI row object should provide information about the height is changed by end user or not
   ZSS-67 Support locale aware Date and Number input 
   ZSS-68 Support showing Date and Number with current locale 
   ZSS-69 Support locale aware drag fill for Month and Week

*Bug
   ZSS-15 edit date cells doesn't work
   ZSS-20 Incorrect PDF export results if merged cell span across page breaks
   ZSS-21 Right click on hyperlink should not jump to the link
   ZSS-22 Shall not allow Copy and Paste operation in a protected spreadsheet
   ZSS-24 key on numpad is not work on Opera
   ZSS-27 Wrap text does not change row height to make all content visible
   ZSS-29 Formula editor cursor not correctly positioned in different browser when focus changed when composing formula
   ZSS-40 Press Ctrl+V for long time does not work correctly
   ZSS-42 Export PDF, merged cell's border doesn't show up correctly
   ZSS-43 Export PDF, sheet break, contains empty page
   ZSS-52 Past special, copy column width's behavior doesn't correct
   ZSS-56 Unlock a cell, protect sheet, cannot double click to edit the cell
   ZSS-61 setSrc doesn't work on a empty spreadsheet
   ZSS-65 When cell wrap, cell shall hide overflow text
   ZSS-70 scroll down with freeze column, in freeze area, some row is empty
   ZSS-71 Use preloadRowSize width column freeze, when scroll down very fast and multiple times in short time, doesn't work well
   ZSS-72 Set one column freeze, and set preloadColumnSize, cause JS error
   ZSS-73 Scroll down and scroll right, then scroll top, cause empty area
   ZSS-74 Set maxcolumns 20 cause JS error
   ZSS-75 Set book null, cause NPE
   ZSS-76 Set data format cause NPE in US locale
   ZSS-77 Drag fill "Jan" on new sheet, cause NPE
   ZSS-78 Implementation of RangeImpl#setValue() is not correct
   ZSS-79 zss JSF component cause JS error
   
* Upgrade Notes
  + Per the feature ZSS-13, Spreadsheet will always open hyperlink in a separate browser tab window. 
    If you need to keep the original behavior (click to open hyperlink in the same browser tab window; 
	CTRL-click to open hyperlink in a separate browser tab window), please specify in zk.xml the 
	following library property to false:
	<library-property>
		<name>org.zkoss.zss.ui.Spreadsheet.linkToNewTab</name>
		<value>false</value>
	</library-property>
	
	------------
ZK Spreadsheet 2.1.1
*Features:

*Bug
   ZSS-25 Cell with hyperlink in Firefox got redundant line
   ZSS-28 Spreadsheet data binding does not work
   ZSS-31 NullPointerException in some application server. ex Domino
   ZSS-32 xls file set cell style cause exception
   ZSS-33 Nullpointer when change the color of cell
   ZSS-34 cell background color does not show in excel
   ZSS-35 A exported xlsx is not loadable again by Excel or Spreadsheet
   ZSS-36 Exception when exporting excel twice
   ZSS-37 A timer doesn't cleanup, cause tomcat cannot stop
   ZSS-39 Hide row on IE7 will popup javascript error message
   
	------------
ZK Spreadsheet 2.1.0

*Features:
   26 Support copy/paste value to local Excel
  161 Support copy&paste from clipboard to a cell
  238 ZK Spreadsheet App: Support select cell reference for formula entrance
  293 Support AutoFilter in 2007 file format(.xlsx)
  294 Support 2003, 2007 Excel file format export to HTML
  309 Support vertical merge
  310 Autofill support number auto linear increase
  312 Autofill support month/week auto increase
  314 Autofill support date auto increase
  316 Autofill support number auto growth(multiply increase)
  319 Support cell vertical alignment
  323 Protecting cells/cell ranges
  330 Support Range#applyFilter for 2007 file format(.xlsx)
  331 Support Range#showAllData for 2007 file format(.xlsx)

*Bug 
  290 Formula cells not always updated
  296 Can't insert formula "=A1" by java
  297 cell color is not right in xls file
  298 input/output/format of number-cells doesn't respect current locale
  300 Numbers in Text-cells are not treated as text (leading zero is removed)
  303 Spreadsheet Mask not removed when set visible of the container
  304 Resizing guiding line does not show
  305 ZK Spreadsheet App: Formula bar text box is not left aligned to just right of f(x) button
  307 chart not shown when set visible of the container of the spreadsheet
  308 Set empty String to cell shall be deemed as blank cell
  311 =20.6+3.6 formula shows incorrect number
  313 Typemismatch exception when Copy formula onto a Text cell
  315 freezed pane rows/columns don t work when setting Spreadsheet from Composer.  
  317 Number 0 shall be date 1900/1/0 0:00 (Java Date 1899/12/31 0:00)
  318 xlsx only. IllegalArgumentException when formula cause a circular reference
  320 NullPointerException when move cell focus
  322 CellStyle.getLocked() always return false in 2007(xlsx) file format.
  324 Spreadsheet wrap text doesn't work
  325 Spreadsheet unwrap text doesn't work
  326 Sizing row height the associated Merged area should sizing accordingly
  328 ZK Spreadsheet App throw ComponentNotFoundException when press "hyperlink" button
  329 Move Focus on hidden row/column, the row/column header highlight is not correct
  332 Scroll sheet down and up cause javascript error
  333 Merged cell with auto filter has more one filter button
  334 AutoFilter cause exception
  336 Showing incorrect contents when press filter drop button in merge cell 
  337 Filter dropdown button incorrectly change to "filter icon" after click the dropdown button and press OK.
  338 Reapply filter fail to work
  339 "=" + mouse click to input formula
  340 Spreadsheet hyperlink font underline in wrong position
  341 ZK Spreadsheet App: open custom sort range twice, UI doesn't work well
  342 ZK Spreadsheet App: use compose formula dialog, when focus one last textbox, focus will change to first textbox
  343 ZK Spreadsheet App: insert image cause class cast exception
  344 ZK Spreadsheet App: after close sheet should not able to click save sheet menu
  345 ZK Spreadsheet App: select a column and apply number format, cause server no response
  346 ZK Spreadsheet App: compose formula dialog input formula to wrong cell
  347 Wrong page orientation for PDF export in Portrait mode
  348 Formula cell formatting lost in PDF export file
  
  
	------------
ZK Spreadsheet 2.0.1

*Features:
  169 xls file support full rgb color
  277 ZK Spreadsheet App: Formula Editor shall support multiple line and extensible
  281 Support wrapping of ZK Spreadsheet as a JSP tag
  278 ZK Spreadsheet App: press ESC shall close(cancel) any wizards/dialogs
  
*Bug 
  268 Enter multiple line in cell but show as one single line only
  269 ZK Spreadsheet App: multiple line in cell but single line in formula bar
  270 Set font style with a cell has white color cause NPL
  271 ZK Spreadsheet App: NPE when focus on formulabar editor with a no book Spreadsheet
  272 ZK Spreadsheet App: NPE when close the book
  273 ZK Spreadsheet App: Shall disable formula bar, insert menu items when there is no book
  274 Rename sheet with a chart inside and export to excel, chart is missing
  275 Rename sheet with a chart and switch sheets cause NPE
  276 ZK Spreadsheet App: Selection shall move to left when shift-Tab on Formula bar editor
  279 ZK Spreadsheet App: a error dialog in compose formula dialog
  280 ZK Spreadsheet App: NPE in compose SUM formula dialog
  282 After "export to Excel", cause XmlValueDisconnectedException
  283 set spreadsheet visible="false" cause error dialog
  284 ZK Spreadsheet App: after delete a sheet, the horizontal scrollbar will disappear
  285 Spreadsheet component with Liferay, on Chrome and IE, Layout is wrong
  286 NPE when load the attached xls file
  287 click on specific cell and set font bold, cause NPE
  288 ZK Spreadsheet App: number format dialog select "General" cause error dialog
  289 xls font color does not match to what was in Excel
  
	------------
ZK Spreadsheet 2.0.0

*Features:
  46  Support showing chart(Bar, Bar3D, Line, Line3D, Pie, Pie3D, Donut, Excel 97-2003, xls)
  134 Support Math formula functions for Matrix operations
  135 Support Math formula functions
  136 Support Statistical formula function for calculating distribution
  137 Support Statistical formula functions for calculating mean
  138 Support Text formula functions
  140 Support Information formula functions
  141 Support showing chart(Bar, Bar3D, Line, Line3D, Pie, Pie3D, Donut, Excel 2007, xlsx)
  142 Support for Date & Time functions
  143 Support for Logical formula functions
  145 Support select range by shift key
  152 Support Ranges.range(sheet, namedRange)
  158 ZK Spreadsheet App support colorbutton without depending zkex
  160 ZK Spreadsheet App support import, open file
  165 Support 2007 Excel file format export to PDF
  192 Support exporting Excel Chart to PDF
  194 ZK Spreadsheet App support shift cell, entire row or column
  199 ZK Spreadsheet App shall support wrap text.
  212 Cannot shift select left on merge cell
  222 ZK Spreadsheet App shall support number format
  234 Support export to xls and xlsx
  246 ZK Spreadsheet App support save file
  247 ZK Spreadsheet App editor shall support tab and cancel key control
  251 ZK Spreadsheet App support set column width and row height
  
*Bug 
  132 view ZK Spreadsheet App index.zul cause NullPointerException
  139 "Unexpected ptg class" RuntimeException when loading Excel file with special formula
  144 copy from a cell to a range
  146 selected range should stay emphasised when click menubutton
  148 Can't delete row in the bottom
  149 change size of multi-column
  150 change size of multi-row
  153 column header is not aligned when resize a freezed column
  154 border not well in all borders, inside borders, inside horizontal borders, inside vertical borders
  155 source region of copy get highlighted in different sheet
  156 spring DelegatingVariableResolver in Spreadsheet doesn't work
  157 fail to delete rows out of original xlsx
  163 Can't set backgrond color to excel 2007 file format
  164 no grid line while export to pdf
  166 ZK Spreadsheet App, Modify the font size, cell height won't automatically adjust
  167 set background color seems like multiple selection in color choosing
  168 Exception while set background color
  170 Set font color of a region with different font size, will resize the font size.
  171 Once clicked, merge button remain pressed state
  172 paste transpose error
  180 ZK Spreadsheet App support hide column/row function
  182 Exception when right click row header and insert a row
  187 Select and focus shall not move when insert/delete columns/rows/cells
  188 NullPointerException when delete columns
  189 Cell formula is not properly shifted when delete rows
  190 Selection is not correctly placed after paste.
  191 Shall return #NAME? when entering a random named function
  193 Throw exception when open a sheet with random named function
  195 Exception when not specified src or book to <spreadsheet>
  196 Range fill down, fill left, fill right, fill up doesn't work
  197 Text color does not respect condition format
  198 Shall be interpret as hyperlink if user enter "http://" into cell
  200 Exception in paste special from context menu
  201 Cell Background Color is not correctly shown in Excel 2007 xlsx
  202 Enter key after copy/cut does not do "paste"
  203 ESC key after copy/cut does not cancel the copy/cut.
  204 ZK Spreadsheet App gridline checkbox is not updated when change sheet
  205 Copy and paste does not copy a merge cell
  206 Cell editing after copy/cut does not cancel copy/cut.
  207 ZK Spreadsheet App focus on formula edit box after copy/cut does not cancel copy/cut
  208 Spreadsheet focus position is lost onBlur
  210 Bug in spreadsheet date-time display
  211 Shift + arrow key selection does not respect merge cell.
  213 ZK Spreadsheet App compalins "Not unique in ID space <Window mainWin>: formulaWin"
  215 ZK Spreadsheet App View->Formula Bar complains "Fellow component not found: formatNumberWin"
  217 ZK Spreadsheet App delete sheet not working
  219 ZK Spreadsheet App rename Sheet, current tab move to 1st sheet tab
  220 ZK Spreadsheet App Formula function selection dialog title is not correct
  221 ZK Spreadsheet App NPE if leave Insert Function Dialog without select an item
  223 Insert/delete row/column to book shall NOT affect maxrows and maxcolumns of the Spreadsheet
  224 Select a range to delete but only left-top cell removed
  225 Exception when remove a row which is referenced by a cell
  226 Exception when change sheet quickly
  227 ZK Spreadsheet App set display gridline doesn't work on IE
  228 In IE, press F2, won't focus on cell for input value
  230 IE cursor position is not at the text end when press F2
  231 Absolute Cell Reference shall not move when copy, paste
  232 NPE when load the attached xlsx file
  233 Right click header selection doesn't work well
  235 Transpose pasteSpecial shall reverse Row/Column formula reference
  236 Delete current sheet and set selected sheet cause exception when use xlsx as source
  239 Bad error code(-60)
  240 Irrelevant merged regions faultly unmerged when delete a cell and shift left
  241 Shall complains about an incorrect formula
  242 Delete key not working when edit cell
  244 ZK Spreadsheet App: formula bar cursor will unexpectedly move to the end of the text
  248 ZK Spreadsheet App: Tab on formula editor if focus on the last visible column, shall not move focus right
  249 ZK Spreadsheet App: Enter on formula editor if focus on the last visible row, shall not move focus down
  252 ZK Spreadsheet App: Click on formula bar editor, the spreadsheet Cell did not change to formula accordingly
  253 ZK Spreadsheet App: Cell wrongly set to incorrect value
  254 Illegal highlight exception when copy and switch sheet
  255 ZK Spreadsheet App: change sheet lost the focus
  256 ZK Spreadsheet App: A Currency number format does not match expected
  257 Style is wrongly copied when insert a row
  258 ZK Spreadsheet App insert whole row/column cause set selection out of range exception
  261 ZK Spreadsheet App: click a cell and set border, cause NPE
  262 ZK Spreadsheet App: unwanted error dialog when sort
  264 ZK Spreadsheet App: Cut should has no memory of area after once copied
  266 ZK Spreadsheet App: Toolbar button Grid line easily unsync
  267 ZK Spreadsheet App: cut & paste column takes too long
  
* Upgrade Notes
  + Package names of classes in zpoi.jar are renamed from org.apache.poi.* to org.zkoss.poi.* to avoid class 
    name conflicts with of those in poi.jar, so it is now OK to put both zpoi.jar and poi.jar in class path.
  + Spec. of Range#getColumn(), Range#getRow(), Range#getLastColumn(), Range#getLastRow(), Range#getCells() has 
    changed from 1-based to 0-based so it consists with other APIs. That is, in new spec, Range#getColumn() 
	return 0 for column A (1st column) and Range#getRow() return 0 for row 1 (1st row).
  + Spreadsheet#getSelectedSheet() return org.zkoss.zss.model.Worksheet
  + Methods range(org.apache.poi.ss.usermodel.Sheet sheet, ...) in org.zkoss.zss.model.Ranges changed signature 
    to range(org.zkoss.zss.model.Worksheet sheet, ...)
	
	------------
ZK Spreadsheet 2.0.0 RC

*Features:
  65 Honer displayGridlines parameter   	 
  70 Support insert rows(Excel 2007, xlsx)
  71 Support delete rows(Excel 2007, xlsx) 
  74 Support insert columns(Excel 2007, xlsx)
  75 Support delete columns(Excel 2007, xlsx)
  76 ZK Spreadsheet App support set font by toolbarbutton and menu
  77 ZK Spreadsheet App support set font size menu and toolbarbutton
  78 ZK Spreadsheet App support set color to cell and font by menu and toolbarbutton
  79 ZK Spreadsheet App support set font bold by menu and toolbarbutton
  80 ZK Spreadsheet App support set font italic by menu and toolbarbutton
  81 ZK Spreadsheet App support set font underline by menu and toolbarbutton
  82 ZK Spreadsheet App support set font strike by menu and toolbarbutton
  83 ZK Spreadsheet App support set cell alignment by menu and toolbarbutton
  84 ZK Spreadsheet App support clear cell style by menu
  85 Support insertRange(Excel 2007, xlsx)   	 
  86 Support deleteRange(Excel 2007, xlsx)
  88 Support moveRange(Excel 2007, xlsx)   	 
  89 Support merge(Excel 2007, xlsx) 
  95 Support for ACCRINT financial funcion
  96 Support for ACCRINTM financial funcion
  100 Support COUPON financial functions
  101 Support DISC financial function
  102 Support DOLLAR conversion financial function
  105 Support DURATION financial function
  107 ZK Spreadsheet App support export PDF
  108 Support showing pictures(Excel 2007, xlsx)
  111 Support exporting selected sheet to pdf
  112 Support exporting selected area to pdf
  113 Support annual interest rate financial functions EFFECT and NOMINAL
  114 Support security related financial function
  115 Support yield related financial function
  116 Support Treasury Bill related financial functions
  120 ZK Spreadsheet App support set hyperlink menu and toolbarbutton
  121 Support Binary number conversion engineering functions
  122 Support Decimal number conversion engineering functions
  123 Support Hexadecimal number conversion engineering functions
  124 Support octal number conversion engineering functions
  126 Support Bessel engineering functions
  127 Support DELTA ERF ERFC and GESTEP engineering functions
  128 Support complex number engineering functions
  129 Support input mask for entering Date or Time into cell.
  130 ZK Spreadsheet App Support display, hide gridlines
  131 Support wrapping ZK Spreadsheet as a JSF Ajax Component

*Bug
  44 Locale is not respected
  61 Fronzen row/column does not comply with Spreadsheet's maxrows/maxcolumn
  64 pasteSpecial copy Validation cause Null pointer exception (Ptgs must not be null) 
  66 Unexpected gridlines shown 
  67 Exception when enter value 0.3308589607635 into cell with text format "# ???/???"
  68 Exception when set text format to ?/2, ?/4, ?/8, ?/16, ??/100
  69 Incorrect text output when enter value 0 into cell with text format "???/???"
  72 IE6 rendering issue - fixed column & row sizes/positions 
  73 Edit on the shorter last visible row cause the grid moving up
  87 =HYPERLINK() function in Excel 2007xlsx not follow as a hyperlink
  91 NPE when load cell with color style(Excel 2007, xlsx)
  93 NPE when load sheet with merge cell
  97 StringIndexOutOfBoundsException if cell text format is _(*"_"??_) 
  98 Freeze area is not rendered if it is on the second sheet
  99 freeze column and freeze row is not reset.
  103 Freeze row/column is not correctly interpreted
  106 NPE when load Excel 2007 file with rich text string
  109 2nd picuture is not shown.
  110 merge area is not reset
  117 Barcode Scanner data incomplete
  119 Typing in 234-6 or 344/2 into cell cause junk number value
  
	------------
ZK Spreadsheet 2.0.0 beta3

*Features:
  36 Support Range.setStyle
  37 Support Range.autoFill
  38 Support Range.clearContent
  40 Support Range.fillUp
  41 Support Range.fillDown
  42 Support Range.fillRight
  43 Support Range.fillLeft
  48 Honer hidden columns	 
  49 Honer hidden rows	 
  50 Support drag to hide column	 
  51 Support drag to hide row	 
  52 Support drag to sizing so un-hide a hidden column	 
  53 Support drag to sizing so un-hide a hidden row	 
  28 Support hideRows
  29 Support unhideRows
  30 Support hideColumns
  31 Support unhideColumns
  55 Support Range.setHidden
  57 ZK Spreadsheet App support sort/custom sort menu and toolbarbutton
  62 Support getRepeatingRowsAndColumns
  58 Support printing ZK Spreadsheet to PDF file
  63 ZK Spreadsheet App support copy/paste/pastSpecial menu and toolbarbutton

*Bug
  56 zss error in log   
  47 zss2 beta 2 IE support
  54 data input errors - lost characters when switching to edit mode
  60 Sort function when select multiple columns cause Nullpointer exception
  59 Sort with case sensitive should be in special spreadsheet order

	------------
ZK Spreadsheet 2.0.0 beta2

*Features:
  6 Support insert rows(Excel 97-2003, xls)
  7 Support delete rows(Excel 97-2003, xls)
  9 Support insert columns(Excel 97-2003, xls)
  10 Support delete columns(Excel 97-2003, xls)
  12 Support sortByColumns
  13 Support sortByRows
  15 Support insertRange(Excel 97-2003, xls)
  16 Support deleteRange(Excel 97-2003, xls)
  17 Support moveRange
  18 Support merge
  19 Support showing bullet list in cell
  20 Support unMerge
  21 Support setBorders
  22 Support setColumnWidth
  23 Support setRowHeight
  25 Support pasteSpecial
  27 Support Hyperlink follow up.
  
*Bug
  11 NPE when click on an empty cell
  14 Picture is not correctly shown(ZK Spreadsheet EE)
  24 Drag selecting an area shall snap to the boundary of merged cells
  32 Wrong height when insert rows
  33 Wrong width when insert columns 
  34 moveRange fail to shift formula correctly
  35 Hyperlink should show the formated text
  
	------------
ZK Spreadsheet 2.0.0 beta (Work with ZK 5 and after)

* Features:
  1 Support ZK 5
  2 Support importing Excel 2007 xlsx file
  3 Showing rich text
  4 Efficient formula dependency tracking
  5 Consistent column width on the browser and Excel application
	
* Upgrade Notes:
  + Ported to work with ZK 5
  + The backend data model and formula evaluation engine is completly _REWRITTEN_
    to be based on Apache POI library(Java API To Access Microsoft Excel Format 
	Files) such that we can support more features. The consequence are most classes 
	and APIs that were in org.zkoss.zss.model of version 1.x are no longer existed.
  + Spreadsheet remove deprecated method setUrl and getUrl. Use setSrc and getSrc 
    instead
  + Spreadsheet remove deprecated method setMaxrow and getMaxrow. Use getMaxrows and
    setMaxrows instead
  + Spreadsheet remove deprecated method setMaxcolumn and getMaxcolumn. Use 
    getMaxcolumns and setMaxcolumns instead
  
	------------
ZK Spreadsheet 1.0.0 RC1 (Work with ZK 3 and before)

Feature:
  1984354 Support fire size change event after set column/row size
  1984356 UI Support handle column/row size change event.
  1989663 Support showing a highlight area 
  1990401 Change setColumnnames to setColumntitles
  1990704 Support tab key to control move right and left
  1991532 Supports client can start editing by press on keys
  1990542 UI support format change event
  1995825 Modify css(.zk) to compete future version of ZK
  2001369 Provide auto adapting FunctionMap of Page to Book
  2001613 A way to enlarge the editing box
  
Bug:
  1986288 Head override scroll bar in some firefox/IE
  1989337 Merged cell error after insert/remove a row
  1989815 Selection out of sync if move cell focus by key
  1989384 insertColumns(-1,-1) bug
  1989379 insertColumns doesn't update UI correctly
  1990632 Border doesn't accrod with background color
  1989384 insertColumns(-1,-1) bug
  1991614 ExcelImporter fail to import Text Format
  1985247 Cell with date format cause exception
  1988691 Number format won't be imported correctly
  1990408 Set row height small than 5 will be broken in IE
  1992587 Style doens't be copied after insert
  1992704 setRowHeight out of boundary add extra space
  1992843 zsw,zsh information doesn't load correctly on header
  1992679 Insert rows in freeze panes doesn't work
  1991498 setFontColor() in Format doesn't work
  1994864 Drag on highlihgt area border cause selection moving
  1994997 onCellSelection has wrong value when click on a merge cell
  1995031 focusTo() doesn't work if doesn't invoke in AU
  1995734 To many custom row height
  1997415 Accounting format has wrong display when value is empty
  1997417 Too large update range in SSData content change event
  1995691 Highlight doesn't showup after invalidate
  2000569 Selection change should fire after mouse up
  2000567 Right click on selected header should not change selection
  2000537 onCellClick should not be fired when mouseup on another cell
  1995689 selection rectangle error when listen onCellClick
  1995735 IE:text doesn't overflow if column width small then 4
  1989680 setColumnWidth Bug
  1991731 SUM(A3:A1) won't be calculated
  2002276 Wrong image widget size
  
* Upgrade Notes
  + setColumnnames/setRownames/getColumnnames/getRownames of UI Spreadsheet were removed, use  
    setColumntitles/setRowtitles/getColumntitles/getRowtitles instead.  
  
  --------
ZK Spreadsheet 1.0.0 beta3

Feature:
  1960727 Support selection of row and column
  1960733 Support selection when mouse dragging on cells
  1963549 Support move and modify the selection range
  1964452 Support selection by key
  1965003 Select all when mouse down on left-top corner
  1970131 Sheet support delete rows, columns, range
  1970128 Sheet support insert rows, columns, range
  1977477 setMaxrow/column support smartUpdate
  1981665 Change setMaxrow to setMaxrows, also at columm
  1981776 Model:Support MERGE events when call merge/unmerge cell
  1977531 UI Support Row/Column Insert/Delete Event of Model    
  1977528 UI Support Merge Event of Model
  1984094 Provide API to get last focus and selection of spreadsheet
  1985245 Change setUrl to setSrc of Spreadsheet
  1985320 Get custom column widths/custom row heights
  
Bug:
  1964249 Move/modify selection doesn't work in freeze row/col mode
  1964255 Reselection in selected range doesn't work in freeze mode
  1965001 The method copyCell only copy values without its format
  1970238 Always show freeze panel when import a empty xls
  1974069 onCellClick Event doesn't be fired.
  1977301 Exception when invoke insertColumn
  1973837 MODEL:Col/Row size doen't be shifted after inserts
  1978676 Model exception when remove/insert a column/row
  1978860 When delete a column/row,no need to send CONTENTS_CHANGE
  1979032 zss css not applied in zssdemo, IE only
  1978933 Exception when delete a row which contains a merge cell 
  1981657 Load extra 1 cell to client side
  1981771 Call unmergeCells twice throws exception
  1982844 Wrong MERGE_CHANGE data when inert column
  1982915 Wrong cell style when CONTENTS_CHANGE event
  1983346 IE : Cell doesn't align after unmerge a long text cell
  1983343 minus number in formula cause exception
  1984095 Selection changed when focus back.
  1984108 focus and selection lost after invalidate()
  1984106 Formula should change when ref cell moved
  1984262 Refer to an empty cell should return 0 not "empty"
  1984347 Destination reference should be delete and cause #REF!
  1985264 Column/row size back to default after invalidate
  1986025 Custom width is not correctly imported
  
* Upgrade Notes
  + setMaxrow/getMaxrow/setMaxcolumn/getMaxcolumn of UI Spreadsheet were deprecated, use  
    setMaxrows/getMaxrows/setMaxcolumns/getMaxcolumns instead.
  +	setUrl/getUrl of UI Spreadsheet were deprecated, use setSrc/getSrc instead.
  
  --------
ZK Spreadsheet 1.0.0 beta2

Feature:
  1941769 Support notify cell update via variable names
  1941909 Support cell editing control event
  1941790 Support Key Event on Spreadsheet
  1950246 Support another way to stop editing event.
  1950247 Support a way to intercept default startEditing value
  1953243 Support initial mask
  1950481 Support displaying Image in Spreadsheet
  1953297 Support retrieve spreadsheet focus
  
Bug:
  1939913 var name loss when import an unknown variable in formula
  1939916 importer throws Unrecognized Function if use unknown func
  1942569 The last 'n' character disapper in formula
  1943565 Bug in notifyChange(String[])
  1943547 The external functions can't be imported
  1950469 Add 2 widgets cause client side error
  1950483 Worng attr value if I set attr after add image widget
  1951423 IE : row is broken when scroll down
  1953236 Cell doesn't be loaded after scrolling
  1953126 command should be delay when spreadsheet is invalidate
  1953830 Unnecessary command was sent and break the processing
  1954061 setWidth setHeight doesn't work
  
  --------
ZK Spreadsheet 1.0.0 beta

Feature:
  1892469 Supports multi-line inline editing
  1871760 Provdes cell style in UI, such as font and border
  1912497 Load Header by demand in UI.
  1907728 Support ErrorCell
  1917924 Support Named Ranges
  1917937 Support Range Operator
  1917938 Support Range Union Operator
  1917941 Support Range Intersect operation
  1906207 Require row index and column index of input array
  1919284 Support constant array formula
  1871755 Provides horizontal cell merging in UI
  1931942 Support resolve a.b.c varible expression
  1930766 Supports Hide Row and Column Header
  1871756 Provides Forzen Panel in UI
  
Bug:
  1891619 Cann't use character ">","<","""
  1906208 Empty String should be deemed as 0d
  1906711 Border didn't show up correctly in Browser
  1902921 Merged cell - validateCorner
  1883293 SSDataEvent not fired when using simple formula
  1906763 Wrong focus mark when change default cell width and height
  1906197 Number of params is not consistent with excel function
  1908659 Cell with format & refer to other cell throws exeception
  1907786 NullPointerException when getTextColor() is invoked
  1908634 Negative Percentage Bug
  1908699 Rounding Bug
  1909323 Space character is skiped in client side
  1909371 Rounding Error
  1907709 Cross reference Refers to Wrong Sheet at Init
  1913313 Reference to an inexisting sheet should return #REF!
  1916449 Cell fill in an error e.g. #DIV/0! should be an Error object
  1916490 A way allows spreadsheet functions to handle "#REF!"
  1917727 Can not view empty sheet
  1932034 Named Range Dependency Issue
  1933107 Cell refer to a Range show Range.toString()
  1919118 Cell display time format at first time editing.
  1933186 Range.getCellsArray() throws IndexOutOfBoundException
  
  --------
ZK Spreadsheet 0.7.0
(ZK Spreadsheet project move to https://sourceforge.net/projects/zss/ after 0.6.0)

Feature:
  1869091 Model support Image
  1871754 Provide text overflow when text is too long in cells
  1871758 Provides Text wrapping in UI
  1871759 Load Cell by demand in UI.
  1883400 The size of column and row can set to zero in UI
  1883403 Supports highlight column and row header of selection range.
  
Bug:
  1882263 Cell.getText() throw exception when has formula.
  1885998 Error when moving focus to a cell which column width is 0
  1886002 Top Head will disappear when scrolling to right most in Opera
  1886003 Cell doesn't be load when I small a column or row

  --------
ZK Spreadsheet 0.6.0

Feature:
  1858877 Sheet support mergeCells and unmergeCells
  1855751 Provide customization of column and row's header name
  1859510 Sheet support getMergeRangs
  1859511 Sheet support defaultColumnWidth, defalutRowHeight
  1859512 Sheet support columnWidth and rowHeight
  1861271 Sheet support columnFreeze and rowFreeze
  
Bug:
  1855748 EmptyStackException when type "=" in cell
  1855750 FormulaListener not work if change the formula value
  1861948 [ZSS] NullPointerException - getMergeRanges()
  
  --------
ZK Spreadsheet 0.2.0
* Support Spread Sheet UI (1st draft)
* Support in-place-edit, top header, left header, scroll in view, selector mark, focus

  --------
ZK Spreadsheet 0.1.0
* Support Spread Sheet model (1st draft)
* Support SUM function
* Support Spread Sheet engine (1st draft)
* Formula parser
* Formula evaluator
* Excel Importer (without format)
