[Webkit-unassigned] [Bug 161133] New: Make RenderMathToken::m_mathVariantGlyph an Optional<GlyphData> to encode its dirtiness

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161133

            Bug ID: 161133
           Summary: Make RenderMathToken::m_mathVariantGlyph an
                    Optional<GlyphData> to encode its dirtiness
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr

The glyph to draw special mathvariant is handled via two members:

GlyphData m_mathVariantGlyph;
bool m_mathVariantGlyphDirty;

They should be merged into a single Optional<GlyphData> where Nullopt means that the glyph is dirty.

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