Reviewed by Darin.

    Reviewed by Darin.

        <http://bugzilla.opendarwin.org/show_bug.cgi?id=10111> - Menu flickers over Flash content
        <rdar://problem/3052546> Plugins don't work with z-index (overlapping elements, etc.)

        * Plugins/WebBaseNetscapePluginView.m:
        (-[WebBaseNetscapePluginView saveAndSetNewPortStateForUpdate:]):
        Don't just clip to the dirty region for "transparent" plug-ins -- do it for all plug-ins.  This is a
        generally useful thing to do, as it prevents the plug-in from drawing over parts of the window that
        have already been drawn and are not expected to be redrawn in the same update.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15845 268f45cc-cd09-0410-ab3c-d52691b4dbfc