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I will try to attach Thread Dump Stack...
Created attachment 16627 [details] Simple text
I know Yarda was working on the undo/redo manager, maybe related? Not sure whose this is.
PatchSet 393 Date: 2004/08/03 15:43:32 Author: jtulach Log: #46818: Additional fix. In order to prevent deadlocks the EditorSupport.createUndoRedo manager has to delegate back to CloneableEditorSupport.createUndoRedo where is the correct good implementation Members: src/org/openide/text/EditorSupport.java:1.7->1.8
verified in [nb_dev](200408091800)