SUMMARY The title. I use the Wayland (default) session of gnome. STEPS TO REPRODUCE 1. Log into the wayland session of Gnome 40.3. 2. Install flatpak, add the "flathub" remote (I'm using it with under the "--user" flag FWIW). Install krita: "flatpak install flathub org.kde.krita -y" 3. "flatpak run org.kde.krita" to run it. Once the program opens try to maximize it. The maximize button may be visible the first time you run it, but once you click, drag or resize the window, it will disappear. OBSERVED RESULT Cannot maximize Krita on Gnome 40. EXPECTED RESULT Be able to maximize it. SOFTWARE/OS VERSIONS Linux: Fedora Silverblue Krita 4.4.3 ADDITIONAL INFORMATION I think that this isn't Gnome's fault since another qt apps work as expected here, including KDE apps like Kdenlive. A bit off-topic but Krita flatpak is very glitchy and kinda unusable here on Gnome, but I'm not willing to report all of them right now.
Sorry, but I'm not going to look into this. In the first place, we don't support Wayland, since it doesn't support tablets properly yet. In the second place, we don't support flatpak, that's done here: https://github.com/flathub/org.kde.krita/, by different people (that repo probably should be the place for a report like this) and lastly, I don't use Gnome, so I cannot test this.