Reviewed by NOBODY (OOPS!).

    Reviewed by NOBODY (OOPS!).

        - fix http://bugzilla.opendarwin.org/show_bug.cgi?id=7071
          REGRESSION: Jumping to an anchor identifier makes page scroll horizontally

        Test: fast/overflow/scroll-vertical-not-horizontal.html

        * rendering/render_layer.cpp: (WebCore::RenderLayer::getRectToExpose):
        Fixed rectangle intersections so that the X and Y dimensions are independent,
        to fix the bug. Also restructured the function a bit so it's even easier to
        read and understand.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@12607 268f45cc-cd09-0410-ab3c-d52691b4dbfc