The following layout test is failing on GTK after it was introduced in r125476.
It's a reftest and the difference is minimal, only in one pixel - at (76,82)
Expected: (174, 174, 174)
Actual: (179, 179, 179)
 - http://trac.webkit.org/changeset/125476
We have exactly the same issue.
Created attachment 329909 [details]
Comment on attachment 329909 [details]
Clearing flags on attachment: 329909
Committed r226175: <https://trac.webkit.org/changeset/226175>
All reviewed patches have been landed. Closing bug.