Reviewed by Alexey Proskuryakov.

        - fix <rdar://problem/6873305> Two distinct characters are not displayed
          correctly with 2 of the font selections from the stickies widget

        Test: platform/mac/editing/pasteboard/text-precomposed.html

        Ensure that "text/plain" data retrieved from the clipboard is always
        precomposed. This makes Clipboard::getData() and
        Pasteboard::documentFragment() consistent with Pasteboard::plainText()
        and -[WebHTMLView _documentFragmentFromPasteboard:forType:inContext:subresources:].

        * platform/mac/ClipboardMac.mm:
        (WebCore::ClipboardMac::getData):
        * platform/mac/PasteboardMac.mm:
        (WebCore::Pasteboard::documentFragment):

WebKit/mac:

        Reviewed by Alexey Proskuryakov.

        - fix <rdar://problem/6873305> Two distinct characters are not displayed
          correctly with 2 of the font selections from the stickies widget

        * WebView/WebHTMLView.mm:
        (-[WebHTMLView _plainTextFromPasteboard:]): Return precomposed text.
        This is consistent with
        -_documentFragmentFromPasteboard:forType:inContext:subresources:.

LayoutTests:

        Reviewed by Alexey Proskuryakov.

        - test for <rdar://problem/6873305> Two distinct characters are not
          displayed correctly with 2 of the font selections from the stickies
          widget

        * platform/mac/editing/pasteboard/text-precomposed-expected.txt: Added.
        * platform/mac/editing/pasteboard/text-precomposed.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43802 268f45cc-cd09-0410-ab3c-d52691b4dbfc