[Webkit-unassigned] [Bug 179122] New: -webkit-scroll size and position not painted correctly under browser zoom

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179122

            Bug ID: 179122
           Summary: -webkit-scroll size and position not painted correctly
                    under browser zoom
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: danyao at chromium.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 325580

  --> https://bugs.webkit.org/attachment.cgi?id=325580&action=review

Screen capture video showing the buggy behavior

Reproduction steps:
1. Load a page that uses -webkit-scrollbar, e.g.
   http://w3c-test.org/visual-viewport/viewport-dimensions-custom-scrollbars-manual.html
   Notice that the custom vertical and horizontal scrollbars touch at the corner
2. Press Ctrl/+ several times. Notice a gap appearing between the corners of the vertical and horizontal scrollbars
3. Press Ctrl/- once. Notice that the scrollbars are not touching at the corner, but a gap appears between each scrollbar and the respective page edge.
4. Press Ctrl/- a few more times. Notice that the edge gaps persist.
5. Press Ctrl/+ once. Notice that the edge gaps disappear, but the corner gap reappears.

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