Steps to reproduce: 1. Go to github.com 2. Log in (accounts are free) 3. Move the mouse right and left over the yellow buttons with the octopus cats on them. --> Notice flashing of background color and failure to repaint whole button/image. Bisected: Works: opensource r159608 Fails: opensource r159609 http://trac.webkit.org/log/trunk/?rev=159609&stop_rev=159609
<rdar://problem/15920727>
Investigating
Found & fixed issue, will upload patch tomorrow.
Altough I already have a patch that fixes this issue (by basically rolling back the changes that affected this particular case when regions are not involved), I will investigate a little bit further the actual cause of this because it could be a GraphicsContext issue.
Created attachment 223106 [details] Patch
Comment on attachment 223106 [details] Patch Clearing flags on attachment: 223106 Committed r163382: <http://trac.webkit.org/changeset/163382>
All reviewed patches have been landed. Closing bug.
This caused bug 135318.