- fixed <rdar://problem/4597685> stale rects for document markers can be left behind in certain cases

        * dom/Document.h:
        * dom/Document.cpp:
        (WebCore::Document::setRenderedRectForMarker):
        changed parameter from IntRect to const IntRect& at Darin's request
        (WebCore::Document::invalidateRenderedRectsForMarkersInRect):
        new method, tests whether the rendered rect for each marker intersects the
        passed rect. If so, sets the rendered rect back to the placeholder rect that
        means that the rect for this marker isn't known.
        
        * page/Frame.cpp:
        (WebCore::Frame::paint):
        call invalidateRenderedRectsForMarkersInRect on the rect we're about to paint.
        This ensures that old stale rects won't be preserved if the associated marker
        has moved such that it is out of the painted area.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14998 268f45cc-cd09-0410-ab3c-d52691b4dbfc