CC @gofman
The issue is reproducible on Windows with dxvk as well. It doesn't look like the blamed commit was wrong per se, it is just that before the commit window size was updated right after fullscreen restore (which was still breaking things elsewhere).
proton 7.0-4x1 2022-09
Since https://github.com/doitsujin/dxvk/commit/cc11bb824045505439604d2bc1af9d805749ed09 in Fairy Fencer F when you click either the borderless or windowed option the game window disappears and can't be opened again. After some seconds it reappears since i can't confirm the new option selection.
Software information
Fairy Fencer F started in fullscreen
System information
Log files
Log from bad commit
FairyFencer_dxgi.log
Log from good commit
FairyFencer_d3d9-good.log