When RenderLayers jump in and out of composited mode, we don't always correctly repaint the old rendering destination, which can cause redraw turds with animations, for example.
Created attachment 28666 [details] Patch, changelog Can't do a testcase until we have repaint tests working with composited content.
Comment on attachment 28666 [details] Patch, changelog r=me
http://trac.webkit.org/