bug#50496: Graphical installer and QEMU

[A. Xander]

Hi!

Switching from the graphical installer to a different virtual terminal is 
awkward in QEMU because the host system intercepts <ctrl-alt-F1 ... 
ctrl-alt-F12>. So QEMU isn't aware it needs to switch to another TTY.

Usually this is quite easy to work around by using <ctrl-arrow left/right> to 
switch from one TTY to another, however this doesn't work in TTY1 with the 
graphical installer. So I ended up having to work around that by entering 
QEMU's command line <alt-ctrl-2> and writing: "sendkey ctrl-alt-f3" and 
returning to the VM via <alt-ctrl-f1>.

My proposed solution would be to ensure this is documented and that the 
graphical installer itself ignores/passed through <ctrl-arrow right>.

Cheers,

- Xander.