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There's a few options how to do the rollover feedback in editor gutter: - change the icon appearance - show a border around icon as in the main toolbar (on Win XP) - change mouse cursor to "hand" I'm not sure which is better. Probably any solution for 6.0 is better than the current state.
I would prefer using the 'hand' cursor. It's self-explanatory and should be reasonably easy to do.
*** This bug has been marked as a duplicate of bug 22722 ***