Reviewed by John

    Reviewed by John

        Fix for this bug:

        <rdar://problem/3917863> REGRESSION (Mail): pasting two lines of plain text copied from an RTF document results in two styles

        Code to figuire out the end node to merge was missing the font tag in the second paragraph
        written out by AppKit convert-to-HTML function. I refined the algorithm to be smarter.

        * khtml/editing/htmlediting.cpp:
        (khtml::ReplacementFragment::mergeEndNode): Refine algorithm used to walk through the fragment being pasted
        looking for the node that is the last inline in the last block of the fragment. The old algorithm was
        insufficiently powerful.
        (khtml::ReplacementFragment::enclosingBlock): New helper function.
        * khtml/editing/htmlediting.h: Add declaration for new helper function.
        * layout-tests/editing/pasteboard/paste-text-011-expected.txt: Added.
        * layout-tests/editing/pasteboard/paste-text-011.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8195 268f45cc-cd09-0410-ab3c-d52691b4dbfc