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DDDataNode fires property changes for a property that is not in its property set (document). This is strange and should be avoided. Any code that relies on this is wrong and probably needs to listen on a different object (DDDataObject - model).
Created attachment 16189 [details] stack trace with comment about problem
What impact on the user does this have? If there is no visible impact, then I suggest downgrading to P4.
OK, but still the way how DDData{Object|Node} work is not easy to understand so it might be worth investigating.
Created attachment 16192 [details] another stacktrace
XML modules are probably responsible for document property. More suspicious is firing of propertySets to force repainting of properties
Transferring to XML module for evaluation
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss