r79167 modified ScrollView::visibleContentsRect and we must update the forked version we use for the GTK+ port.
Link to the changeset that broke the test: http://trac.webkit.org/changeset/79167
Created attachment 83373 [details] Patch
Comment on attachment 83373 [details] Patch OK.
Committed r79350: <http://trac.webkit.org/changeset/79350>
Apologies for the breakage, and thanks for fixing this!
(In reply to comment #5) > Apologies for the breakage, and thanks for fixing this! No problem! Eventually, when I have more time I'd like to figure out a way to share this code with everyone.