Minimize if maximized and run an app with other resolution
If I run Vivaldi at the 'maximize-button size' at a monitor with 2560x1440 and run a game with 1920x1200 in fullscreen (display changes the resolution). Then after ending the game the vivalid window changed it size as well, to 1920x1200 I think. If I tab out during game play it changed to about 640x480. Firefox and any other Application don't behave like this.
It's annoying to change the size all the time.