normalized all text drawing code paths for selected
        and unselected cases.  Still need to work on
        TextSlave::checkSelectionPoint.  Fixed redraw region
        problems.

        khtml redraw the entire visible region when selection changes.
        This could be optimzed.

        * khtml/rendering/font.cpp:
        (Font::drawText):
        (Font::width):
        * khtml/rendering/render_text.cpp:
        (TextSlave::printSelection):
        * kwq/KWQPainter.mm:
        (QPainter::drawText):
        (QPainter::selectedTextBackgroundColor):
        * kwq/KWQScrollView.mm:
        (QScrollView::contentsX):
        (QScrollView::contentsY):
        * kwq/WebCoreTextRenderer.h:
        * kwq/qt/qpainter.h:

        Many improvements to selection.  More Cocoa like,
        normalized all text drawing code paths for selected
        and unselected cases.

        Still need to work on:
        1.  'slow' drawing cases, i.e. runs with non-base characters
            or runs requiring font substitution.
        2.  Select All menu item.
        3.  Auto scrolling.

        * WebCoreSupport.subproj/IFTextRenderer.m:
        (-[IFTextRenderer drawString:atPoint:withColor:]):
        (-[IFTextRenderer drawGlyphs:numGlyphs:fromGlyphPosition:toGlyphPosition:atPoint:withTextColor:backgroundColor:]):
        (-[IFTextRenderer slowDrawCharacters:length:fromCharacterPosition:toCharacterPosition:atPoint:withTextColor:backgroundColor:attemptFontSubstitution:]):
        (-[IFTextRenderer _drawCharacters:length:fromCharacterPosition:toCharacterPosition:atPoint:withTextColor:backgroundColor:]):
        (-[IFTextRenderer drawCharacters:length:atPoint:withTextColor:backgroundColor:]):
        (-[IFTextRenderer drawCharacters:length:atPoint:withTextColor:]):
        (-[IFTextRenderer drawCharacters:stringLength:fromCharacterPosition:toCharacterPosition:atPoint:withTextColor:backgroundColor:]):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@1447 268f45cc-cd09-0410-ab3c-d52691b4dbfc