Long user names of editors break layout of author card

[cellio]

meta:292654

When the username of someone who edited a post is long, it causes the stuff under the post to wrap, resulting in the author's user card moving to the left instead of being on the right as usual. Can we either add vertical space in that case (so there's room for the author to be in the usual place) or set bounds for the editor name and wrap/truncate names that exceed the limit? (If truncate, we should end with ... to indicate that it's not the full name.)

See the meta post for a screenshot of the layout problem.