In r202273 I added webkitWebViewBaseResizeRedirectedWindow() helper to remove duplicated code in all places where we were resizing the redirected window to the current drawing area size. But on size allocate, we were updating the redirected window first, and then the drawing area, to ensure that when the drawing area notifies the web process the redirected window is already at the new size. This regression doesn't have any visual effect, because we are ensure the right size always before rendering, but there's a small extra resize in this case.
Created attachment 283133 [details] Patch
Thanks for the patch. If this patch contains new public API please make sure it follows the guidelines for new WebKit2 GTK+ API. See http://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API
Committed r203215: <http://trac.webkit.org/changeset/203215>