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I went to Options / Fonts and clicked on the (...) button to change the default font. The Font Chooser dialog opens but nothing is shown inside and the IDE freezes. It is not easily reproducible.
Created attachment 38059 [details] Thread dump
Looking at the thread dump I can't really see any deadlock. Are you sure that the IDE was forzen (ie. no CPU activity)? Have you attached the right thread dump? We know about the deadlock in issue #92449, which could be the same situation, but your FTD does not show that.
Yes, as far as I can tell, the AWT thread was frozen, IDE was not repainting itself and I could not do anything with it. There was no CPU activity. Yes, this is the right thread dump.
I see, well, the only suspicios code I can see is the static initialization of o.n.m.editor.java.Utilities. I'll reassign this to the java guys to have a look.
The "OpenIDE-request-processor-4" thread seems to be actually waiting until o.n.m.e.j.Utilities clinit finishes, and the clinit waits for a lock that is held by "OpenIDE-request-processor-4".
Already fixed. *** This issue has been marked as a duplicate of 92449 ***