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040714, 1.5.0 b58, GTK. I had selected a (private) field in some module project and typed Alt-E N to invoke Find Usages. Nothing seemed to be happening so I typed N again (thinking that it had not registered the first time). A little while later, the Find Usages dialog appeared but when it was finished with its work, this NPE was thrown, the usages window was empty, and the character 'n' had appeared in the text editor. Probably this means that the Find Usages action is failing to open the proper dialog within the same EventQueue event that the action is invoked in, and instead doing some slow background work, letting the system meanwhile process GUI events such as key types.
Created attachment 16286 [details] Stack trace
I cannot reproduce it in latest build. We made some improvements in refactoring actions. If it happens again, please reopen this issue. Thanks.