[Webkit-unassigned] [Bug 205990] New: [HarfBuzz] A partially selected RTL text is placed at a wrong vertical position if it has a vertical initial advance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205990

            Bug ID: 205990
           Summary: [HarfBuzz] A partially selected RTL text is placed at
                    a wrong vertical position if it has a vertical initial
                    advance
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Hironori.Fujii at sony.com
                CC: mmaxfield at apple.com

[HarfBuzz] A partially selected RTL text is placed at a wrong vertical position if it has a vertical initial advance

GTK port, trunk at 254184

1. Go to https://ar.wikipedia.org/wiki/%D8%B3%D9%88%D8%B1%D8%A9_%D8%A7%D9%84%D8%A5%D8%AE%D9%84%D8%A7%D8%B5
2. Select a text which has Arabic diacritics by drugging mouse cursor slowly

You can observe glyphs are dancing vertically.

This issue still happens even after r254190 fixing other initial advance bug (Bug 118221).

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