Warning messages due to implicit selection of xpra:
$ xpra --version
xpra v3.0.6-r25177
$ x11docker --podman --desktop --size 1400x900 x11docker/mate
x11docker note: Option --podman: experimental only.
x11docker note: Using X server option --xpra
x11docker note: Your xpra version is out of date. It is
recommended to install at least xpra v1.0. Look at: www.xpra.org
x11docker note: Your xpra version does not support desktop mode.
Please use another X server option like --xephyr or --nxagent.
x11docker note: Xpra desktop mode works best since xpra v2.2-r17117.
You have installed lower version xpra .
It is recommended to use --xephyr or --nxagent instead.
Rendering issues can be reduced disabling OpenGL in Xpra tray icon. Screen
size issues can be avoided with non-integer scaling (e.g. --scale=1.01).
...
Warning messages due to implicit selection of
xpra
: