[Webkit-unassigned] [Bug 120451] New: Make SVGTextContentElement methods behave consistently with Firefox and IE

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=120451

           Summary: Make SVGTextContentElement methods behave consistently
                    with Firefox and IE
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: zimmermann at kde.org, krit at webkit.org, thorton at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/f28cb3ba700c3faf578046a6b7fa7f9cf17d04c7

Make SVGTextContentElement methods behave consistently with Firefox 23 and
IE10:
- We should not throw when negative values are passed in arguments as long
  as they wrap to a valid positive index.
- Arguments should be mandatory

Also fixed a bug in SVGTextContentElement.getSubStringLength() where the
wrong result would be returned if the nchars argument was
too large due to an overflow. To avoid this issue, we clamp the nchars
value to (numberOfChars - charnum) similarly to what is done in
SVGTextContentElement.selectSubString(), and as per the specification:
http://www.w3.org/TR/SVG2/text.html#__svg__SVGTextContentElement__getSubStringLength

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