[Webkit-unassigned] [Bug 159063] New: characterSubrange returns a single character range for an empty range

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159063

            Bug ID: 159063
           Summary: characterSubrange returns a single character range for
                    an empty range
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: enrica at apple.com, rniwa at webkit.org

As seen in bug 159062, DictionaryLookup::rangeAtHitTestResult returns a 1-character string when -[LULookupDefinitionModule tokenRangeForString:range:options:] returns (0, 0).

This seems like a pretty crazy bug deep inside editing code - why do we do this? We pass (0, 0) to TextIterator::subrange, then it goes to characterSubrange, and it becomes 1-character when routed through a character iterator.

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