In Safari, if you have "new tabs open with empty page" and "show compositing borders" on, opening a new window will result in white repaint counters on the tiles, indicating that accelerated drawing is not being used for the tiles. Subsequent navigations will do the right thing. This regressed in kling's http://trac.webkit.org/changeset/154616 -- I'm guessing the part in WebPage.cpp where the DrawingArea construction was reordered, but could be something else.
Created attachment 272573 [details] Patch
Comment on attachment 272573 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=272573&action=review > Source/WebCore/ChangeLog:8 > + Robustify the hey-the-Settings-changed callbacks in Page to handle document-less frames. Can you explain here how this is related to the other change?
Created attachment 272586 [details] Patch for landing
Comment on attachment 272586 [details] Patch for landing Clearing flags on attachment: 272586 Committed r197409: <http://trac.webkit.org/changeset/197409>
All reviewed patches have been landed. Closing bug.
This regressed some stuff http://trac.webkit.org/changeset/197452