SUMMARY In my 3 monitor setup xwayland apps always start on the left screen. This produces multiple problems. The most annoying one is steam games. They always start on the most left monitor. Even if a game has a setting to change the monitor e.g. "Battlerite" it doesn't. Apps like spotify and others also start on the most left screen. On X11 there's a setting for a main monitor that the games will run from. From what I've heard it doesn't make sense on wayland from technical point of view. But from user point of view I can't run games on the monitor I want + apps start on the most left monitor that could be TV for example which can be annoying. Wayland apps, such as kate or firefox in wayland mode respect that setting and start on monitor that mouse is on. STEPS TO REPRODUCE 1. Start Spotify(any xwayland app) OBSERVED RESULT App starts on the most left screen EXPECTED RESULT App should start on the screen that mouse is. SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.19.90 KDE Frameworks Version: 5.74.0 Qt Version: 5.15.1 Arch Linux ADDITIONAL INFORMATION
There is now a "Primary Screen" setting on Wayland that XWayland apps will respect. In an ideal world, apps would never try toopen on the primary screen and would instead let the window manager position their windows according to its own consistent rules (one of which could be "always open new windows on the primary screen").