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Created attachment 158612 [details] Thread-Dump while Lock. I tried to open a big java-file (~20.000 Lines). The problem is, that this window produces a Lock in combination of "Lenthy operation in progress" - Dialog. -> Result: I can´t close the Dialogs and have to kill NetBeans.
The navigation is a part of the java/editor.
Fixed in jet-main. http://hg.netbeans.org/jet-main/rev/9c7dbc20a834
Integrated into 'main-silver', will be available in build *201603160001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/9c7dbc20a834 User: Dusan Balek <dbalek@netbeans.org> Log: Issue #258115 - Opening a big java-File ends in GUI-Lock - fixed.