Improve KWin's response to connecting an external display that is too big
At the moment it freaks out a bit and makes it seem like it almost works. We should:
- Show an error message, like a notification, saying what happened
- We could try with a lower resolution or a mode that we know it is going to work.
This is especially relevant to the PinePhone since it has a specially small amount of memory.
Edited by Aleix Pol Gonzalez