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Build 2.1 RC 1 1. Select org.eclipse.jface.action.Action 2. Refactor->Use Supertype Where Possible 3. Select IAction 4. Check "Replace the selected supertype..." 5. Press Preview ==> Internal Error. See attached picture and .log
Created attachment 3713 [details] The refactoring dialog showing the internal error message
Created attachment 3714 [details] .log
why is it critical?
I did not do an analysis in which i.e. how many cases it fails. Maybe it is really a corner case then it is 'normal' or 'major' but maybe it happens in 70% of the cases and then 'critical' is the right severity. Feel free to downgrade it after you investigated the problem.
fixed