Bug 481222

SUMMARY
First of all, a big THANK YOU for all the hard work and improvements around the multi-screen support. Plasma 5.x always felt a bit unreliable when connecting external screens. The RC 2 already feels much much better. Specially the "unify output" mode, which was quite broken in Plasma 5.x in my opinion.

After playing around with different setups, I only notice one small bug. My laptop has a 16:10 screen. When I connect at 16:9 external monitor and I change to "unify outputs" mode, the resolutions (correctly!) changes to a 16:9 one. There are some black bands in the built-in laptop screen (as it should!) and the external screen shows exactly the same as the laptop without any artifacts as it happens with Plasma 5.27.10.

However, when detaching the external monitor, the 16:9 resolution is kept instead of restoring the native 16:10 one.


STEPS TO REPRODUCE
1. Select native 16:10 resolution on a laptop (in my case 1920x1200)
2. Attach an external 16:9 monitor (in my case I tried with a 1920x1080 one)
3. Switch to "unify outputs" mode
4. Detach external screen

OBSERVED RESULT
Laptop keeps the 1920x1080 (16:9) resolution with black bands on the top and bottom edges

EXPECTED RESULT
Laptop should switch back to its native 16:10 resolution before the "unify outputs" mode was enabled


SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0
Kernel Version: 6.7.4-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz
Memory: 15.3 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics
Manufacturer: LENOVO
Product Name: 20XYCTO1WW
System Version: ThinkPad X1 Yoga Gen 6