[Webkit-unassigned] [Bug 159421] New: Method getCharNumAtPosition doesn't work with textPath

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159421

            Bug ID: 159421
           Summary: Method getCharNumAtPosition doesn't work with textPath
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrii at mamchur.net
                CC: zimmermann at kde.org

Created attachment 282791
  --> https://bugs.webkit.org/attachment.cgi?id=282791&action=review
getCharNumAtPosition work for first glyph only

Method SVGTextElement.getCharNumAtPosition doesn't work correctly when SVGTextElement contains SVGTextPathElement.

Steps to reproduce:
1. Create SVG with textPath element (see tutorial http://tutorials.jenkov.com/svg/textpath-element.html)
2. Call SVGTextElement.getCharNumAtPosition method to get char index by specified x, y position

See online example http://mamchur.net/issues/getCharNumAtPositionIssue/index.html
Just press "Monte Carlo Hit Test" several times & observe issue

Actual Results:

SVGTextElement.getCharNumAtPosition returns -1 and 0 values only

Expected Results:
See https://www.w3.org/TR/SVG/text.html#__svg__SVGTextContentElement__getCharNumAtPosition

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