ControlHandle is used to switch the active vt, while DisplayHandle is
used by display drivers to register new vt's. There are entirely
unrelated tasks and the fact that they had been merged together has been
confusing me for a while.
Also changed activating a VT to no longer create a new vt when none
existed previously. The target graphics driver may not be able to handle
the new VT. inputd -A already didn't allow activating non-existent VT's
as it first tried to open a consumer handle for the target VT.
bjorn3
273cbda872