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I just got deadlock in Beta 1. I'm recording it in hope that somebody will get idea what's wrong just from the tread dump. If not, feel free to lower priority or even close this issue because I'm not able to reproduce it and provide any more info. Also I'm not sure the deadlock is in editor, but it is editor who is blocking AWT thread.
Created attachment 17063 [details] tread dump
It's deadlock of document versus CloneableOpenSupport$Listener. Reassigning to openide/editor.
Yardo, you were fixing some deadlock-on-close recently and played with undo/redo queue threading a bit...
*** This issue has been marked as a duplicate of 46981 ***