Patch against Linker.php r50720 - approximate number of edits in rollback
It's not particularly clear what the difference is between rollback and undo, as shown at http://lists.wikimedia.org/pipermail/wikitech-l/2009-May/042946.html, and I've chosen the wrong link myself before.
Perhaps it would be better if the link text read "rollback 3 edits | undo" - instead of "rollback | undo". The estimated number of edits could be anything from 1 to (literally) 10+. This should be enough to disambiguate the functionality.
If this code would run too slow on heavy traffic wikis, perhaps we could make it optional.
Somewhat related to the discussion at bug #10531.
attachment Linker.diff ignored as obsolete