Created attachment 805821 [details] quick moving showing bug Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:26.0) Gecko/20100101 Firefox/26.0 when editing a a textarea where deleted characters causes changes to word wrapping, two lines are displayed overlapping. hard to explain, so i've attached a quick movie.
Maybe bug 916751?
looks right, thanks. i searched for lots of things, but not "glitches" :)