[Webkit-unassigned] [Bug 186010] New: REGRESSION (r95391-r232220): Incorrect font used to render decomposed grapheme cluster in some cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186010

            Bug ID: 186010
           Summary: REGRESSION (r95391-r232220): Incorrect font used to
                    render decomposed grapheme cluster in some cases
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: NeedsRadar, Regression
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mitz at webkit.org
                CC: mmaxfield at apple.com

In the following test case:

<div style="font-family: verdana, times;">
    i&#x0302; and i&#x033f;
</div>

the first grapheme cluster (lowercase I with combining circumflex) is rendered in Times, but it should be rendered in Verdana.

This works correctly in OS X Mountain Lion 10.8.5, after <https://trac.webkit.org/r95391>, the fix for bug 68287, but got broken some time between then and r232220. The problem is that Font::canRenderCombiningCharacterSequence() started returning false for Verdana and the i+circumflex sequence.

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