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CompletionJavaDoc is changing the visibility of its components from inside of non-AWT thread, which can cause deadlock. Will attached stacktrace.
Created attachment 5266 [details] Stack trace of AWT-EventQueue and OpenIDE-request-processor-0
*** Issue 22004 has been marked as a duplicate of this issue. ***
fixed in [maintrunk] /cvs/editor/libsrc/org/netbeans/editor/ext/CompletionJavaDoc.java,v <-- CompletionJavaDoc.java new revision: 1.3; previous revision: 1.2
Probably can only happen while doing external reload of a file.
Yes, it have happened during document reload, but No, it could happen anytime when something is changing the document from out of AWT thread and changing document from other threads shall work OK.
Resolved for 3.3.x or earlier, no new info since then -> closing.