[webkit-reviews] review requested: [Bug 123549] Repro scrolling crash with scrollbars that use setPresentationValue on the scrolling thread : [Attachment 215600] Patch

[bugzilla-daemon at webkit.org]

Beth Dakin <bdakin at apple.com> has asked  for review:
Bug 123549: Repro scrolling crash with scrollbars that use setPresentationValue
on the scrolling thread
https://bugs.webkit.org/show_bug.cgi?id=123549

Attachment 215600: Patch
https://bugs.webkit.org/attachment.cgi?id=215600&action=review

------- Additional Comments from Beth Dakin <bdakin at apple.com>
Here's a speculative fix. Unfortunately I have not been able to repro this in
my own build, but it is probably timing-dependent, so that might make sense.