[Webkit-unassigned] [Bug 154366] New: AX: AXObjectCache::visiblePositionForTextMarkerData() doesn't account for equivalent visibly equivalent positions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154366

            Bug ID: 154366
           Summary: AX: AXObjectCache::visiblePositionForTextMarkerData()
                    doesn't account for equivalent visibly equivalent
                    positions
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d_russell at apple.com
                CC: webkit-bug-importer at group.apple.com

visiblePositionForTextMarkerData transforms TextMarkerData into a VisiblePosition. As a sanity check it compares the node and offset values of the position returned by createLegacyEditingPosition() with the deepEquivalent() of the resulting VisiblePosition. This doesn't account for canonicalization of the position via Position::upstream and Position::downstream causing the position to incorrectly be considered invalid.

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