Reviewed by John

    Reviewed by John

        Fix for this bug:

        <rdar://problem/3907422> REGRESSION (Mail): Pasting quoted content can place content after body element

        * khtml/editing/htmlediting.cpp:
        (khtml::ReplaceSelectionCommand::doApply): Detect when the body element is the "reference block" used
        for determining the location for inserting content. Do not allow an insert before or after if the
        reference block is the body. Perform insertNodeAt(0) and appendNode, respectively, in the block-is-body case.
        * layout-tests/editing/inserting/insert-3907422-fix-expected.txt: Added.
        * layout-tests/editing/inserting/insert-3907422-fix.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8148 268f45cc-cd09-0410-ab3c-d52691b4dbfc