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While switching from one open Java document to another using the document tabs at the bottom of the editing window the IllegalStateException occurs. The annoying thing is that the exception continues to occur thereafter on every switch and requires closing editing window.
Created attachment 12038 [details] NetBeans' ide.log
*** Issue 36976 has been marked as a duplicate of this issue. ***
Actually, it seems this is linked to some race condition in PositionRef.Manager, which somehow gets out of sync with document state. See issue 37178. *** This issue has been marked as a duplicate of 37178 ***