RFC - Manual changes for Plasma 6.4.0

Plasma 6.4.0 will need manual intervention if you are on X11 On Plasma 6.4 the wayland session will be the only one installed when the users does not manually specify kwin-x11. With the recent split of kwin into kwin-wayland and kwin-x11, users running the old X11 session needs to manually install plasma-x11-session, or they will not be able to login. Currently pacman is not able to figure out your personal setup, and it wouldn't be ok to install plasma-x11-session and kwin-x11 for every one using Plasma. tldr: Install plasma-x11-session if you are still using x11