If ending an out-of-bounds pinch gesture with releasing one finger (transition to a pan gesture), the bounce back animation blinks in the end position immediately first, then animates the content back into bounds.
Created attachment 143574 [details] proposed patch
Comment on attachment 143574 [details] proposed patch Good catch
Comment on attachment 143574 [details] proposed patch Clearing flags on attachment: 143574 Committed r118341: <http://trac.webkit.org/changeset/118341>
All reviewed patches have been landed. Closing bug.