3.12.1
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* Fix opacity values from _NET_WM_WINDOW_OPACITY [Nirbheek; #727874]
* Misc. cleanups [Jasper; #720631]

Contributors:
  Nirbheek Chauhan, Jasper St. Pierre

Translations:
  Inaki Larranaga Murgoitio [eu], marablack3 [el]