3.15.3
======
* Add support for high-contrast themes [Florian; #740447]
* Fix banner message on login screen without user list [Ray; #703972]
* Fix flicker when activating windows on another workspace [Florian; #741680]
* Misc. bug fixes [Giovanni, Florian; #735308, #740237]

Contributors:
  Giovanni Campagna, Florian Müllner, Jasper St. Pierre, Ray Strode

Translations:
  Balázs Úr [hu], Josef Andersson [sv], Muhammet Kara [tr],
  Baurzhan Muftakhidinov [kk], Inaki Larranaga Murgoitio [eu]