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don't know how to reproduce. I just tried to switch to another editor from java.util.Date
Created attachment 13459 [details] Threads dump
From the line numbers in CloneableEditor it seems that you have the build before the fixing of issue 40026 which is now fixed. This is in fact dup of the problem described in issue 40026. *** This issue has been marked as a duplicate of 40026 ***
ok