Public bug reported:

[ Impact ]

When I screenshot (by pressing PrintScreen button) pretty much any game
(non-game applications like Chromium or VLC don't have this issue) that
renders in fullscreen (Vulkan or OpenGL), screenshots always come out
completely blank and transparent.

[ Test case ]

Run a game full-screen, hit Print Screen to get a screenshot:
  - Expect the screenshot to be saved in the picture folders and to contain the 
game screen

[ Regression potential ]

Screenshots on X11 might cause a bit more resources and could be taken
with some delay.

** Affects: mutter
     Importance: Unknown
         Status: Unknown

** Affects: mutter (Ubuntu)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress

** Affects: mutter (Ubuntu Groovy)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress

** Bug watch added: gitlab.gnome.org/GNOME/mutter/-/issues #1453
   https://gitlab.gnome.org/GNOME/mutter/-/issues/1453

** Also affects: mutter via
   https://gitlab.gnome.org/GNOME/mutter/-/issues/1453
   Importance: Unknown
       Status: Unknown

** Also affects: mutter (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Changed in: mutter (Ubuntu Groovy)
   Importance: Undecided => Medium

** Changed in: mutter (Ubuntu Groovy)
       Status: New => In Progress

** Changed in: mutter (Ubuntu Groovy)
     Assignee: (unassigned) => Marco Trevisan (Treviño) (3v1n0)

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https://bugs.launchpad.net/bugs/1908164

Title:
  Impossible to get screenshot of fullscreen games

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