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See the attached exception. I invoked the action when the window was showing Package level view. Next time I did not get the exception and it worked as expected.
Created attachment 20335 [details] NPE stacktrace
Created attachment 20359 [details] Stack trace against latest sources
Fixed in M6 release.
Verification of old issues.
Closing old issues.
Reverting to the original Target Milestone value changed by mistake. Sorry for inconvenience.