Unable to alt+tab away and back, aka Xorg focus view

[kaihendry]

Compatibility Report

• Company of Heroes 2
• 231430

System Information

• GPU: AMD Ryzen 7 PRO 4750U with Radeon Graphics
• Driver/LLVM version: 4.6 (Compatibility Profile) Mesa 20.2.3 (git-8440307a61)
• Kernel version: 5.9.12-arch1-1
• https://gist.github.com/kaihendry/ad8411e7287c1f296b120443694960f6
• Proton version: 5.0-10 https://s.natalian.org/2020-12-08/coh2-proton.png

Btw Neither Proton 5.13-3 or the Steam Linux Runtime is able to launch this game. It does have a Linux port 5.x, but I need to run under Proton to play multiplier online. :/

I confirm:

• [X] that I haven't found an existing compatibility report for this game.
• [X] that I have checked whether there are updates for my system available.

https://s.natalian.org/2020-12-08/steam-231430.log

Symptoms

When I Alt-Tab aka change views in my Xorg environment, I can't switch back to the game.

Reproduction

Launch and Alt-Tab twice

[kisak-valve]

Hello @kaihendry, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/3875#issuecomment-740590827.