handle the iconification/activation of notification windows correctly
handle the iconification/activation of notification windows correctly

  * src/mcompositemanager.cpp:
    -- skipStartupAnim(): skip it also for notifications; this only
       matters if the window is restored
    -- clientMessageEvent(): if some bright mind managed to iconify
       a notification window do that to the topmost one to get sane
       transition; otherwise we not only get a junky animation, but
       also leave the notification permanently translated to (-dpywidth,0)

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