[Webkit-unassigned] [Bug 212534] New: Event regions are wrong in the scrolled contents layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212534

            Bug ID: 212534
           Summary: Event regions are wrong in the scrolled contents layer
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

The event region in the scrolled contents layer covers only the visible part, meaning that if you swipe then tap before we've done layout/rendering update, you get the wrong region types.

RenderBlock::paintObject() uses:
auto borderRect = LayoutRect(paintOffset, size());
which is obviously wrong for the contents of scrolled overflow.

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