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It is definitely wrong when TC is being closed to initialize TC ui. Call stack attached.
Created attachment 68441 [details] Call stack when componentShowing is invoked
hopefully fixed in #031c97aab2a4
Integrated into 'main-golden', will be available in build *200810031107* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/031c97aab2a4 User: Dafe Simonek <dsimonek@netbeans.org> Log: #145292: disable activation of most recent editor inside close all and close all except actions