[Bug 1977790] [NEW] Window could be glitched with Intel + NVIDIA GPU laptops, and prime-select set to intel

[Yao Wei]

Public bug reported:

[Summary]
Firefox on Ubuntu 20.04 (99.0build2-0ubuntu0.20.04.2) window could be glitched with laptops with Intel + NVIDIA GPU, and prime-select set to intel.

Either setting gfx.x11-egl-force-disabled to true in about:config, or
setting prime-select to on-demand or nvidia, makes the issue
unreproducible.

Note that through GUI, prime-select cannot be set to intel.

Reproducibility: 1/8

[Reproduce Steps]
1. Run `sudo prime-select intel` in Terminal then reboot
2. Open Firefox window
3. Close Firefox window
4. Repeat until window is glitched (usually Firefox being transparent except the borders of the window)

[Results]
Expected: Firefox should not have its window glitched
Actual: Firefox is glitched with window being transparent but the border, and every window on top of it draws on the Firefox window.  Video attached.

** Affects: oem-priority
     Importance: Undecided
         Status: New

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: oem-priority originate-from-1977786 somerville

** Attachment added: "img_2430_resize.mov"
   https://bugs.launchpad.net/bugs/1977790/+attachment/5595155/+files/img_2430_resize.mov

** Tags added: oem-priority originate-from-1977786 somerville

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Title:
  Window could be glitched with Intel + NVIDIA GPU laptops, and prime-
  select set to intel

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