Mouse still moving In-game even when I'm in the steam overlay

[Goatwithaboat]

Whenever I play a game on Linux Mint via Steam play, if I go into the steam overlay and move the mouse around, the mouse will also move in-game. This happens in all the games I play and happened on both my laptop and desktop.

For example, I will be playing Mordhau and may want to look up something on the overlay browser, and while I'm moving the mouse, my character in Mordhau will be looking around wherever i move the mouse.

This issue happens in any game that requires the mouse for camera movements. I was hoping someone else has had this issue and managed to fix it.

[thetargos]

Yes I see the same "issue", which is why I usually bring the Overlay prior bringing the game menu, as it will not auto-pause games when playing games through Proton. Sadly I know of no fix or work aound other than opening the menu manually.

[Marlock]

So I did a search for similar issues on Valve's Proton GitHub:
https://github.com/ValveSoftware/Proton/issues?utf8=%E2%9C%93&q=is%3Aissue+pause+overlay

I looked up the word pause inside all results, and all but one entry are using it to refer to other issues (game's pause menu freezing, game pauses - a.k.a. lags/freezes - when it shouldn't)

I did find a single report of the exact same behaviour in the middle of a Metal Gear Solid V issue thread:
https://github.com/ValveSoftware/Proton/issues/124#issuecomment-450702065

And then someone commented asking if this behaviour isn't specific to some games and coherent to overlay behaviour on windows (and if so, arguably a bug/feature in the game, not on Proton)
https://github.com/ValveSoftware/Proton/issues/124#issuecomment-471862318

You should report it under the Mordhau issue thread (Valve asks that users keep a single issue per game) and link the Metal Gear report in it. Here is the currently open Mordhau issue thread:
https://github.com/ValveSoftware/Proton/issues/2629