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No idea how to reproduce; just happened to me once (dev-040109). I typed something and the editor window stopped repainting. I had to close the document and reopen it to recover. No data loss - still offered a save dialog, did not freeze whole IDE.
Created attachment 12810 [details] Thread dump
BTW is the editor module responsible for the absurd number of inactive RequestProcessor threads?
It may or may not be the editor. Some time ago I've added the "[Was:" info the the inactive RP, but it wasn't enough ;-) So I've added the class name of the last runnable to the info. Generally, it is caused by wrong usage of RP.getDefault().
When this repaint frost happen? If immediatelly after deserialization of the editor pane during IDE startup it should be duplicate of issue #38993 As for inactive RP threads, it could be issue #36394 We should resolve it to NB 3.6 Assigning to Mila, he already works on issue #38993, which is similar.
I believe issue was fixed by some other integration, since there were no similar issues entered for a long time... Please, reopen if you can reproduce it.