Custom scaling is reset when changing display configuration with the switcher widget (Super+P)
Similar to #1532 but not quite.
I have two 4K monitors at 200% scaling, one is turned off. If I activate the second one by using the display output widget with Super+P and choosing Join Displays, both monitors are enabled (as intended) but both are reset to 100% scaling.
GNOME uses the correct, previously used, scaling for the newly activated monitor AND doesn't reset the scaling for the already active monitor.