[Webkit-unassigned] [Bug 234816] New: Repaint issues with font-palette / colored Ahem

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234816

            Bug ID: 234816
           Summary: Repaint issues with font-palette / colored Ahem
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d-r at roettsches.de
                CC: mmaxfield at apple.com

Created attachment 448229

  --> https://bugs.webkit.org/attachment.cgi?id=448229&action=review

Example of repaint issues with color Ahem when modifying font-palette

Safari TP Release 137 (Safari 15.4, WebKit 17613.1.11.8)

1) Open http://wpt.live/css/css-fonts/font-palette-13.html
2) Inspect element on colored Ahem Square
3a) Disable font-palette in Style or
3b) Change fontsize between 48px to 54px up and down, step by step by using arrow up/down

Actual:
1) Remaining red lines stuck on top and below of Ahem block

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