Upstream fix for checkboxes and radios in gtk3.14
    
    - The "shadow" is re-enabled, the full size of the app menu in the system tray
      is resolved upstream - gtkmenu: fix unnecessary scroll buttons gtk-3-14
      https://git.gnome.org/browse/gtk+/commit/?h=gtk-3-14&id=695ff38
    - The same applies to the Shimmer Project Desktop Suites for Xfce as a whole,
      i.e. Greybird, Bluebird and Albatross.
    - With these two corrections bugs #1114161, #1139190 and #1139187
      are solved completely.