TileQt::updateBackBuffer() applies a translate operation that is never unapplied, this can cause layers to be painted in incorrect positions more or less randomly.
Created attachment 212349 [details]
Comment on attachment 212349 [details]
Clearing flags on attachment: 212349
Committed r156272: <http://trac.webkit.org/changeset/156272>
All reviewed patches have been landed. Closing bug.
Re-opened since this is blocked by bug 121909
Turned out this patch actually did nothing. It was fluky in my testing that I observed a change. The underlying was solved by merging the patch from bug #105494