SUMMARY STEPS TO REPRODUCE 1. Install a GTK app like gnome-disk-utility; 2. Open it, maximize it and reopen the app; 3. Do step 2 again, but this time move the window to another position of the screen. OBSERVED RESULT The window preferences will not be remembered when starting the app again. EXPECTED RESULT SOFTWARE/OS VERSIONS Operating System: KDE neon 5.21 KDE Plasma Version: 5.21.5 KDE Frameworks Version: 5.82.0 Qt Version: 5.15.2 Kernel Version: 5.4.0-74-generic OS Type: 64-bit Graphics Platform: X11 Processors: 8 × Intel® Core™ i5-8265U CPU @ 1.60GHz Memory: 15,5 GiB of RAM Graphics Processor: Mesa Intel® UHD Graphics 620 ADDITIONAL INFORMATION
On X11, it's up to apps themselves to do this, and this is what KDE apps that remember their size and position are doing. So if GNOME apps aren't doing so, it's because they're lacking the feature. On Wayland, the window manager is responsible, so it would be feasible to have it automatically remember size and position for all windows. For that, see Bug 15329.