Use switcheroo-control to get the list of GPUs. For each one of the GPUs
listed, switcheroo-control will give us environment variable we should
set before running our helper to be able to get the renderer from it.
This means that it will finally work when one of the GPUs is driven
with the NVidia drivers, as switcheroo-control sets the correct envvars
for this driver, and that we also support more than 2 GPUs.
Closes: https://gitlab.gnome.org/GNOME/gnome-control-center/merge_requests/601
This check was added when Wayland support was added, so we wouldn't
try to run an X11-only helper. The helper now supports Wayland, and
gnome-control-center (and GNOME) only supports X11 and Wayland. In fact,
we always want to run that code.
This is supposed to give information that's not easily accessible to an
end user otherwise. It's supposed to give information "at a glance" and
should be removed when X11 is removed.
When the virtualization widgets are hidden, the following widets don't need to
move up. This seems to be due to the orignal author thinking this was required
or a bug in GTK rendering a double space between these rows.
