[Webkit-unassigned] [Bug 216023] New: RenderText::computeCanUseSimplifiedTextMeasuring() seems bogus

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216023

            Bug ID: 216023
           Summary: RenderText::computeCanUseSimplifiedTextMeasuring()
                    seems bogus
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmaxfield at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

RenderText::computeCanUseSimplifiedTextMeasuring() has:

    TextRun run(m_text);
    run.setCharacterScanForCodePath(false);
    if (font.codePath(run) != FontCascade::Simple)
        return false;

and FontCascade::codePath() has:

    if (!run.characterScanForCodePath())
        return Simple;

and

bool characterScanForCodePath() const { return m_characterScanForCodePath; }

this code sure looks like:
1. Explicitly set m_characterScanForCodePath to false
2. If m_characterScanForCodePath is false, use the simple text codepath

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