3.21.4
======
* Fix missing frame border around GTK+ dialogs [Florian; #745060]
* Improve X11 <-> wayland copy and paste interaction [Carlos; #768007]
* Add support for NV_robustness_video_memory_purge extension [Rui; #739178]
* Fix restoring the old focused window on restart [Owen; #766243]
* Fix fullscreen windows on other monitors stealing focus after closing
  a window [Rui; #768221]
* Draw monitor content to individual framebuffer [Jonas; #768976]
* Provide screen capture API [Jonas; #768978]
* Misc. bug fixes and cleanups [Rui, Owen, Luca, Olivier, Jonas, Carlos;
  #767969, #768243, #762407, #767997, #768039, #768977, #768977]

Contributors:
  Jonas Ådahl, Luca Bruno, Olivier Fourdan, Carlos Garnacho, Rui Matos,
  Florian Müllner, Owen W. Taylor

Translations:
  Andika Triwidada [id]