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This is effectively a duplicate of issue 77333 and issue 81028, but because each of those was fixed in one way or another, I believe this is a new issue, brought about by some recent change in either the model or the tools interface. 1. Create a new XML schema. 2. Add an element -- document is marked dirty (you will see a * in the editor title bar) and Save toolbar button is enabled. 3. Invoke the Undo operation -- document remains dirty, but should have been marked clean.
Needs to be revisited...
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