Reviewed by Hyatt

    Reviewed by Hyatt

        Fix for this bug:

        <rdar://problem/4012058> Copy from quoted text and paste results in blue text

        The relatively-new paste code tries hard to retain style of the content from the
        source location. However, in the case of quoted material in mail messages, we do
        not want to carry the quoting color along. This fixes the problem by factoring
        out such colors.

        * khtml/editing/htmlediting.cpp:
        (khtml::ReplacementFragment::computeStylesAndRemoveUnrendered): Now calls removeBlockquoteColorsIfNeeded()
        to fix bug.
        (khtml::ReplacementFragment::removeBlockquoteColorsIfNeeded): New function. Factors out colors that are
        the result of text being quoted.
        (khtml::isNodeRendered): Function moved in file. No other change.
        (khtml::isProbablyBlock): Function moved in file. No other change.
        (khtml::closestMailBlockquote): New function. Helps fix bug.
        (khtml::isMailBlockquote): Function moved to be free-floating instead of being a
        member of CompositeEditCommand. No other change.
        * khtml/editing/htmlediting.h: Moved around some functions. Added removeBlockquoteColorsIfNeeded().
        * khtml/editing/markup.cpp: Remove redundant static implementation of isMailBlockquote.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8621 268f45cc-cd09-0410-ab3c-d52691b4dbfc