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I opened the nbwicketsupport project and, with focus in a java source, right clicked in explorer. The UI was frozen for about a minute. Thread dump attached.
Created attachment 46639 [details] Thread dump
Note I was editing a file full of references to JMI classes that cannot be resolved, fwiw.
Seems more like RecentProjectsAction problem to me.
duplicate of #106037 *** This issue has been marked as a duplicate of 106037 ***