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When switching from one project group to another, NB hangs. Windows are not repainted and everything freezes. It was not the first time this happened, but it was the first time I managed to get a thread dump (attached).
Created attachment 54703 [details] Thread Dump
It looks like deadlock around OpenProjectList lock, which is locked by org.netbeans.modules.project.ui.groups.GroupsMenu request processor. However I wasn't able to find why org.netbeans.modules.project.ui.groups.GroupsMenu request processor itself got locked. Anyway, passing to projects and ccing java and tasklist, hope that I'm right...
it seems to be caused by what the org.netbeans.modules.websvc.core.jaxws.projects.WebWSSupportLookupProvider$1.projectClosed method is doing in the "org.netbeans.modules.project.ui.groups.GroupsMenu" thread. reassigning to websvc for evaluation.
I'll try to fix the deadlock for M1.
Fixed by fixing issue 125750.
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