46.8

• Use BT709 coefficients and limited range for YUV conversion by defaults
  [Robert; !4204]
  
• Also request high priority secondary EGL context [Jonas; !2973]
  
• Fix applying initial _NET_WM_WINDOW_OPACITY on Xwayland [Olivier; !4170]
  
• Misc. bug fixes and cleanups [Bilal, Bartłomiej, Sebastian, José, Michel;
  !4176, !4199, !4157, !4168, !4149]
  

Contributors:
Michel Dänzer, Bilal Elmoussaoui, José Expósito, Olivier Fourdan,
Robert Mader, Bartłomiej Piotrowski, Sebastian Wick, Jonas Ådahl
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