Reviewed by Richard

    Reviewed by Richard

        <rdar://problem/3748323> Problem with -[WebView editableDOMRangeForPoint:] (-isFlipped not taken into account?)
        <rdar://problem/3852590> REGRESSION (Mail): Dropped content appears in wrong place if Mail message is scrolled down

        When implementing drag and drop, moveDragCaretToPoint: and editableDOMRangeForPoint: are used in
        concert to track the mouse and determine a drop location, respectively. However, moveDragCaretToPoint:
        did a conversion of the passed-in point to the document view's coordinate space, whereas
        editableDOMRangeForPoint: did not. Now it does.

        Note that I will need to coordinate with Grant to have him roll out some code in Mail that
        attempts to work around this problem (unsuccessfully), and actually manages to block the
        real fix (which needs to be in WebKit).

        * WebView.subproj/WebView.m:
        (-[WebView editableDOMRangeForPoint:]): Convert the passed-in point to the document view's coordinate space.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8106 268f45cc-cd09-0410-ab3c-d52691b4dbfc