--when real panel views are slided out either for auto
hiding, dodge case or dynamically removing their screen
margin the desktop available space should not be
changed; it should stay the same.
--Plasma 5.18 introduced a new dbus interface in order
for external apps to be able to publish to Plasma how
much they occupy from screen space. This is a much
requested feature from users, Latte is now publishing
both its availableScreenRect and availableScreenRegions
and this is also Multiple Layouts aware at runtime.
BUG:391073