[Webkit-unassigned] [Bug 200888] New: Composited overscroll in position: fixed paints wrong

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Aug 19 09:35:11 PDT 2019


            Bug ID: 200888
           Summary: Composited overscroll in position: fixed paints wrong
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pdr at google.com

Created attachment 376691

  --> https://bugs.webkit.org/attachment.cgi?id=376691&action=review


When composited overscrolling in position:fixed, the scroller can repaint incorrectly.

To reproduce:
1) Open the attached testcase.
2) Use the trackpad to scroll the green box down
3) Use the trackpad to fling scroll the green box up
4) While the green box is overscrolled, quickly fling scroll the green box up again.

A screenshot of this bug is available at http://pr.gg/safariscrollbug.png

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