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Property: org.zkoss.zul.drop.allowNullDragged

Dndsmalltalk-check-icon.png globally in zk.xml via <library-property>
Dndsmalltalk-cross-icon.png not as <custom-attribute>
Default: false
[since 8.6.2]

If the value is true, then the DropEvent will allow NULL Component without throwing an exception, which means the dragged component was detached or destroyed.

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