Wrong resolutions with multiple monitors

• mpv version: tested release 0.34 and master mpv-x86_64-20220717 (both same bug)
• Windows Version: Windows 11 (latest updates until 22020708)
• Source of the mpv binary: sourceforce
• If known which version of mpv introduced the problem: Not known
• Possible screenshot or video of visual glitches: NA

Reproduction steps

The problem is following:

• I open a random 4k video from Windows command prompt (https://www.youtube.com/watch?v=13ak62OpE7k):
  (I have downloaded this video in 4k mp4 format and renamed the local copy as testi.mp4)

Monitor 1: LG OLED (4096x2160)
mpv --no-config --screen=1 testi.mp4 --geometry=400 --no-hidpi-window-scale -> real resolution in pixel is about 480
mpv --no-config --screen=1 testi.mp4 --geometry=600 --no-hidpi-window-scale -> real resolution in pixel is 720 x 405
mpv --no-config --screen=1 testi.mp4 --geometry=800 --no-hidpi-window-scale -> real resolution in pixel is 960 x 540
mpv --no-config --screen=1 testi.mp4 --geometry=900 --no-hidpi-window-scale -> real resolution in pixel is 1080 x 608
mpv --no-config --screen=1 testi.mp4 --geometry=1000 --no-hidpi-window-scale -> real resolution in pixel is 1200 x 675
mpv --no-config --screen=1 testi.mp4 --geometry=1100 --no-hidpi-window-scale -> real resolution in pixel is 1319 x 742
mpv --no-config --screen=1 testi.mp4 --geometry=1200 --no-hidpi-window-scale -> real resolution in pixel is 1440 x 810
mpv --no-config --screen=1 testi.mp4 --geometry=1300 --no-hidpi-window-scale -> real resolution in pixel is 1560 x 878
the results are the same with or without --no-hidpi-window-scale

Monitor 2: FullHD monitor (res. 1080x1920 -> portrait mode)
mpv --no-config --screen=2 testi.mp4 --geometry=400 --no-hidpi-window-scale -> real resolution in pixel is about 370
mpv --no-config --screen=2 testi.mp4 --geometry=600 --no-hidpi-window-scale -> real resolution in pixel is 476 x 268
mpv --no-config --screen=2 testi.mp4 --geometry=800 --no-hidpi-window-scale -> real resolution in pixel is 638 x 359
mpv --no-config --screen=2 testi.mp4 --geometry=900 --no-hidpi-window-scale -> real resolution in pixel is 716 x 703
mpv --no-config --screen=2 testi.mp4 --geometry=1000 --no-hidpi-window-scale -> real resolution in pixel is 796 x 448
mpv --no-config --screen=2 testi.mp4 --geometry=1100 --no-hidpi-window-scale -> real resolution in pixel is 844 x 475
mpv --no-config --screen=2 testi.mp4 --geometry=1200 --no-hidpi-window-scale -> real resolution in pixel is 846 x 476
mpv --no-config --screen=2 testi.mp4 --geometry=1300 --no-hidpi-window-scale -> real resolution in pixel is 846 x 476
the results are the same with or without --no-hidpi-window-scale

Monitor 3: 4k monitor (res. 3840x2160)
mpv --no-config --screen=3 testi.mp4 --geometry=400 --no-hidpi-window-scale -> real resolution in pixel is about 400
mpv --no-config --screen=3 testi.mp4 --geometry=600 --no-hidpi-window-scale -> real resolution in pixel is 599 x 337
mpv --no-config --screen=3 testi.mp4 --geometry=800 --no-hidpi-window-scale -> real resolution in pixel is 800 x 450
mpv --no-config --screen=3 testi.mp4 --geometry=900 --no-hidpi-window-scale -> real resolution in pixel is 899 x 506
mpv --no-config --screen=3 testi.mp4 --geometry=1000 --no-hidpi-window-scale -> real resolution in pixel is 999 x 562
mpv --no-config --screen=3 testi.mp4 --geometry=1100 --no-hidpi-window-scale -> real resolution in pixel is 1098 x 618
mpv --no-config --screen=3 testi.mp4 --geometry=1200 --no-hidpi-window-scale -> real resolution in pixel is 1200 x 675
mpv --no-config --screen=3 testi.mp4 --geometry=1300 --no-hidpi-window-scale -> real resolution in pixel is 1299 x 731
the results are the same with or without --no-hidpi-window-scale

The resolutions on screens are not the right ones in monitor 1 and 2. A bug in the software.
The result is the same in all videos in every resolution (at least with mp4 which I tested).
And in the monitor 2 the max resolution is 850 even thou it should be 1080.
Resolutions above have got using 'i' of the MPV window.

And here comes the funny part: When I open the video with monitor 1 and drag the window to monitor 2 the resolution change!
--geometry=1000 / Monitor1: 1200x675 -> only drag to Monitor2: 796x448 (same as directly to monitor2)
--geometry=1100 / Monitor1: 1319x472 -> only drag to Monitor2: 876x493 (direcly to Monitor2: 844x475) !
--geometry=1200 / Monitor1: 1440x810 -> only drag to MOnitor2: 958x539 (direcly to Monitor2: 846x476) !
--geometry=1300 / Monitor1: 1560x878 -> only drag to MOnitor2: 1036x583 (direcly to Monitor2: 846x476) !

mpv.log

I can reproduce this anytime.

We discussed about the issue in the #MPV IRC-channel and based on the discussions report this obvious bug.

Start by reproducing the listed --screen and --geometry commands on the three monitors, then inspect mpv.log and the window-size reporting behavior. Done means geometry produces correct video dimensions on each monitor and dragging the window between monitors updates those dimensions consistently.