[Webkit-unassigned] [Bug 179682] New: Incorrect bounds inside <mover>/<munder> when a stretchy operator is present

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179682

            Bug ID: 179682
           Summary: Incorrect bounds inside <mover>/<munder> when a
                    stretchy operator is present
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: MathML
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lambda at liu.ms

The current layout algorithm for <mover>/<munder> does not give the correct bounds for each part (base/over/under> if a part contains a stretched operator. Instead, the bound is calculated by layout-ing the children of each part individually. The behavior is buggy as:

1. It is against the logical idea of bounds.
2. It is confusing when a user examines the bounds of those elements, like when inspecting elements.
3. It requires a dirty fix in RenderMathMLOperator::paint, which leads to the other bug https://bugs.webkit.org/show_bug.cgi?id=170272.

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