Monitor layout forgotten when switching a monitor (even though virtually)
On a first glimpse, constantly switching monitor setups isn't a very common use case. I've been happily using my ultrawidescreen 49" Samsung Odyssey C49RG90. From time to time I switch it to dual input setup to play on the playstation 5 connected via hdmi. At that point it switches from the 120Hz fullsize resolution to running at 100Hz and uses half the screen for my workstation and one the ps5. Effectively this is as if I plugged in a different monitor. So far so good.
Sadly I've added even more complexity to the mix and started using the Cintiq 21UX screen tablet. At that point mutter starts misremembering the layout of the halfscreen + tablet. It will not respects which screen I will set as primary or their relative position and will reset the next time, every time.