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Following contract will be hard to maintain without verification suite: This method may return a String, in which case the property editor will be updated using its setAsText() method, and the value taken from the property editor. Implementations are free to also return either null when appropriate, a String appropriate for use with the property editor's setAsText() method, or an object instance compatible with the property in question's setValue() method.
Done.
If you want me to verify, tell me where.
http://openide.netbeans.org/source/browse/openide/test/unit/src/org/openide/explorer/propertysheet/CustomInplaceEditorTest.java.diff?r1=1.1&r2=1.1.2.1 - verified