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IDE stays frozen when a test in the commit validation suite tries to close file opened in editor. It seems there can be a dead lock (look at attached thread dump). It started to happen in build 20040812-0503 but it doesn't happen regularly and that's why I cannot say which commit it caused. It is high priority issue because it blocks coomit validation suite.
Created attachment 16772 [details] Thread dump
*** This issue has been marked as a duplicate of 46981 ***
OK, I've just read your post to nbdev.