Closes #3185.

For context, a while back I had opened #2511 to close #1272. For some
reason the change got reverted, though, which I think is why #3185 was
opened.

This PR makes the essentially the same change as #2511, so it has the
"refactor" button tooltip show the full path of the file it's going to
refactor. #2511 also changed the width of the button, but I've changed
my mind on that.
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