[Webkit-unassigned] [Bug 205302] New: -[UIWKDocumentContext markedTextRange] is wrong when the caret is not at the start of marked text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205302

            Bug ID: 205302
           Summary: -[UIWKDocumentContext markedTextRange] is wrong when
                    the caret is not at the start of marked text
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com
                CC: wenson_hsieh at apple.com

-[UIWKDocumentContext markedTextRange] wrong in almost all circumstances (the only exception is when the selection is a caret at the start of the composition range). This is partially due to logic in UIKit that attempts to compute -markedTextRange without considering the overlap between `contextBefore` and `markedText`, but also due to `selectedRangeInMarkedText` being wrong, since distanceBetweenPositions(A, B) returns a negative value if A comes before B.

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