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rdar://problem/6024267cfleizach@apple.com authored
<rdar://problem/6024267> VO unable to read massive emails because AccessibilityObject::lengthForVisiblePositionRange makes the string Improves performance of asking for the length/string of text marker ranges git-svn-id: http://svn.webkit.org/repository/webkit/trunk@34748 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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