In my experience, on wayland with pretty much up to date Plasma (Non-beta on Arch), not for your specific applications but as someone that sometimes reboots, or shutdowns, with Browser, E-mail client, Dolphin and/or more accidentality other Windows still open.
They will be restored but on a Multi Monitor setup annoyingly not necessarily on the Monitor where they were.
That could be because I have set Plasma to initially open applications under my Mouse as a workaround for another issue I had in the past. But in my opinion that setting should only apply for (manually) starting not for a restore.
Not sure if the state of KDE session restore already matches the upcoming Wayland session restore protocol, though.
Yes I saw Ff-based browsers and one (the last) Dolphin window restore fine on Plasma 6.3.6. They do save their state internally I guess, Gwenview and Kwrite don’t seem to? Maybe Plasma history settings?
I will test on X11 on 6.3.6 and let you know here.
6.7 auspices sound nice, hope the content is also re-opened.
5.27.12 (X11) could/can reopen in tiles, but it’s the position, not the actual tile state (snapped into), but the window is a floating window in the same position the tile was in the session before.
Although it didn’t log me out the first time on X11, and I forcefully had to. It restored the windows of said 2 applications on X11 after a reboot. It also restored them back in Wayland, although maximized.
I will prbb. lose them when I log out of Wayland. > Edit, yepp.