The fast/regions/overflow/overflow-region-float.html layout test is failing on GTK since r177658 (trac.webkit.org/changeset/177658).
This test changes dashed and dotted border painting and it causes that one part of border of the test is not rendered.
The diff is the following:
This has been passing since r191658.
Committed r194306: <http://trac.webkit.org/changeset/194306>