If you swipe back on iOS and then put your finger on the screen before the view gesture snapshot is taken down, your gestures will not be recognized, even after the snapshot is taken down, until after you lift your finger off the screen and back on. This makes MobileSafari look more unresponsive than it needs to be.
Created attachment 384766 [details]
Comment on attachment 384766 [details]
Clearing flags on attachment: 384766
Committed r253076: <https://trac.webkit.org/changeset/253076>
All reviewed patches have been landed. Closing bug.