https://bugs.kde.org/show_bug.cgi?id=479293

--- Comment #6 from Stefan Hoffmeister <stefan.hoffmeis...@econos.de> ---
The matching Fedora Rawhide (40) GNOME setup, which runs in legacy mode (no
atomic mode-setting) exposes the exact same behavior as KDE Plasma 6 b2+ (git
master) on Wayland.

To that extent, there may be a commonality to the multi-monitor Wayland driving
of GNOME and KDE Plasma 6 on Fedora Rawhide (40).

Additional data point: 

I also tried KDE Plasma 5.27.10 in an X11 session on Arch Linux, with the same
virtual graphics "hardware" setup and with legacy mode setting. In that X11
environment, the screens both left-extend and right-extend correctly for
rendering (this was also working previously on F39, do not have this infra at
the moment).

Note that that the KDE X11 setup has challenges in cursor to (virtual) screen
mapping though - but those can be fixed by running a script that uses
kscreen-doctor to "re-layout" the screens in a different sequence (cf
https://github.com/vmware/open-vm-tools/issues/484#issuecomment-1703922094.

So, in theory, given the above, one could argue that Wayland KDE Plasma 6 has
regressed relative to X11 KDE Plasma 5.27.10.

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