[webkit-reviews] review requested: [Bug 56493] Drag-scrolling overlay scrollbars thumb in overflow regions does not work : [Attachment 88847] Patch for transformed and/or positioned overflow areas

[bugzilla-daemon at webkit.org]

Beth Dakin <bdakin at apple.com> has asked  for review:
Bug 56493: Drag-scrolling overlay scrollbars thumb in overflow regions does not
work
https://bugs.webkit.org/show_bug.cgi?id=56493

Attachment 88847: Patch for transformed and/or positioned overflow areas
https://bugs.webkit.org/attachment.cgi?id=88847&action=review

------- Additional Comments from Beth Dakin <bdakin at apple.com>
Okay, this approach might be a little crazy. To get the ClipRects right
(necessary for positioned objects to hit test properly), this patch re-computes
ClipRects whenever we paint to hit test so that painting does not include the
scrollbar size and hit testing does. This might be completely crazy. Maybe it
would be better to have two instances of the ClipRects? One could be the
painting ClipRects and one could be the hit-testing ClipRects. Anyway, I
thought I would put this out there and gauge opinions on the matter.