When I want to get the diff between two revisions from the history, I select them and type 'enter'. Since revision deletion has been introduced, it no longer takes the action to [Compare selected revisions] but instead [Del/undel selected revisions] (and always returns an error since no rev was marked for deletion). Since comparing revs is much, much more common than deleting revs, the action for enter should be to compare.

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Severity: normal