[Webkit-unassigned] [Bug 162933] New: REGRESSION(r203289): Debug Assertion in Wikipedia Page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162933

            Bug ID: 162933
           Summary: REGRESSION(r203289): Debug Assertion in Wikipedia Page
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org
                CC: simon.fraser at apple.com

Visit the Wikipedia page for Levenshtein Distance in a debug build of WebKit:

    https://en.wikipedia.org/wiki/Levenshtein_distance

This triggers the following assertion:

    void MathOperator::stretchTo(const RenderStyle& style, LayoutUnit targetSize)
    {
        ASSERT(m_operatorType == Type::VerticalOperator || m_operatorType == Type::HorizontalOperator);
        calculateStretchyData(style, false, targetSize);
        if (m_stretchType == StretchType::GlyphAssembly) {

The assertion fires because we are attempting to apply the 'stretchTo' operation on a "NormalOperator" type.

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