User proper rounded border snapping instead of relying on float arithmetic.
Created attachment 230713 [details]
This is the second, cleanup part of the text-area's decoration is off-by-one bug.
Created attachment 230715 [details]
Comment on attachment 230715 [details]
Clearing flags on attachment: 230715
Committed r168211: <http://trac.webkit.org/changeset/168211>
All reviewed patches have been landed. Closing bug.