[Webkit-unassigned] [Bug 172911] New: Elements with position: fixed; repaint when window scroll position is set via JavaScript

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172911

            Bug ID: 172911
           Summary: Elements with position: fixed; repaint when window
                    scroll position is set via JavaScript
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: peter at labwire.ca
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Bug demo: https://codepen.io/peterhry/full/PmMyeB/

Enable "paint flashing" and notice how the element with `position: fixed` repaints continuously as the scroll position is set by JavaScript. This does not happen in Safari 10, Chrome, or Firefox.

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