[Webkit-unassigned] [Bug 259674] New: unionRect(const Vector<LayoutRect>&) behaves incorrectly with empty rects

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259674

            Bug ID: 259674
           Summary: unionRect(const Vector<LayoutRect>&) behaves
                    incorrectly with empty rects
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

unionRect(const Vector<LayoutRect>&) behaves incorrectly if the input vector contains a single zero-size rect with a non-zero location; it will union with the empty rect, and therefore return the empty rect.

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