Also fixes a bug with an empty room settings window introduced in the
port.

Also fixes some resize issues with stupid workarounds to our resize
logic. This really needs to be cleaned up at some point!

The loss in durability shouldn't matter, if we can just receive the same
events again after a restart

Integrating that in our CI is currently a bit hard, so disable it for
now, if GStreamer isn't found. Just make sure to build against GStreamer
for call support!