3.21.90
=======
* Consider XDG_SESSION_TYPE when determining session type [Jouke; #759388]
* Re-add support for edge scrolling on some touchpads [Bastien; #768245]
* Support mouse and trackball acceleration profile [Jonas; #769179]
* Draw monitor contentn to individual framebuffer [Jonas; #768976]
* Support virtual input devices [Jonas, Carlos; #765009]
* Set correct output scale on hotplug [Jonas; #769505]
* Misc. bug fixes and cleanups [Florian, Jonas, Thomas, Bastien, Carlos;
  #769014, #769024, #769054, #769070, #769036, #769305, #769578, #769800,
  #769073]

Contributors:
  Jonas Ådahl, Carlos Garnacho, Thomas Hindoe Paaboel Andersen, Simon McVittie,
  Alberts Muktupāvels, Florian Müllner, Bastien Nocera, Jouke Witteveen

Translations:
  Daniel Mustieles [es], Aurimas Černius [lt], Dušan Kazik [sk],
  Fabio Tomat [fur], Balázs Úr [hu], Yosef Or Boczko [he], Marek Černocký [cs],
  Matej Urbančič [sl]