Can't play video on multiple displays using either fs-screen=all or using geometry

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Important Information

• mpv version

  mpv 0.35.0-396-ga1a2e27f84 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
  built on Wed May 24 07:24:32 2023
  libplacebo version: v5.264.0-261-g541c85ec
  FFmpeg version: N-110760-g0bce5590c3
  FFmpeg library versions:
  libavutil       58.9.100
  libavcodec      60.14.101
  libavformat     60.5.100
  libswscale      7.2.100
  libavfilter     9.8.100
  libswresample   4.11.100

• Linux Distribution and Version

  Operating System: Ubuntu 20.04.6 LTS
          Kernel: Linux 5.15.0-72-generic
    Architecture: x86-64

• Source of the mpv binary Built using https://github.com/mpv-player/mpv-build with ./use-mpv-master

• If known which version of mpv introduced the problem Have found it to be down to v0.30

• Window Manager and version GNOME Shell 3.36.9

• GPU driver and version

  
  # Tried both default mesa, and various other ppas
  > glxinfo -B
  name of display: :0
  display: :0  screen: 0
  direct rendering: Yes
  Extended renderer info (GLX_MESA_query_renderer):
  Vendor: Intel (0x8086)
  Device: Mesa Intel(R) UHD Graphics 600 (GLK 2) (0x3185)
  Version: 22.2.0
  Accelerated: yes
  Video memory: 1797MB
  Unified memory: yes
  Preferred profile: core (0x1)
  Max core profile version: 4.6
  Max compat profile version: 4.6
  Max GLES1 profile version: 1.1
  Max GLES[23] profile version: 3.2
  OpenGL vendor string: Intel
  OpenGL renderer string: Mesa Intel(R) UHD Graphics 600 (GLK 2)
  OpenGL core profile version string: 4.6 (Core Profile) Mesa 22.2.0-devel (git-08da37035f)
  OpenGL core profile shading language version string: 4.60
  OpenGL core profile context flags: (none)
  OpenGL core profile profile mask: core profile

OpenGL version string: 4.6 (Compatibility Profile) Mesa 22.2.0-devel (git-08da37035f) OpenGL shading language version string: 4.60 OpenGL context flags: (none) OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 22.2.0-devel (git-08da37035f) OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

### Reproduction steps

Have 2 displays connected, and run mpv with any of the following options:

- `--fs --fs-screen=all`
- `--geometry=3840x1080+0+0`

### Expected behavior

Video plays across both displays taking up all the space (3840x1080)

### Actual behavior

Video resizes to play on a single display (1920x1080).

### Log file

I've made 2 sets of log files - the first 2:
- [fs.log](https://github.com/mpv-player/mpv/files/11559551/fs.log) - regular run with --fs (works as expected and plays on current screen)
- [fs-screen-all.log](https://github.com/mpv-player/mpv/files/11559550/fs-screen-all.log) - `--fs --fs-screen=all` doesn't work. Suddenly resizes back to 1920x1080 at line 463

And then I found using geometry I could play across both screens but not full height. It stopped working when going from 3840x432 to 3840x433.
- [geometry432.txt](https://github.com/mpv-player/mpv/files/11559553/geometry432.txt) - `--geometry=3840x432` works as expected
- [geometry433.txt](https://github.com/mpv-player/mpv/files/11559554/geometry433.txt) - `--geometry=3840x433` gets resized to 1920x1080 at line 544

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Here's another log file geometry433vvv.txt with -v -v -v to include even more info. It includes some XEvent: ... lines at around line 3250-3260, right before the resize to 1920x1080 that might be of interest.

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Also important.. it works fine dragging the window using the mouse to make it fill both displays.

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I couldn't find anything about adding bug bounty to this project, I hope it's allowed, but I'd like to add 500$ to this issue. Is there a specific service maintainers prefer or would direct payment by any means be fine?

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This is unfortunately still an issue with 0.38 :-(

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@Dudemanguy Would love to sponser someone to do the fix here - Would you be able to look at it, or know of other maintainers that could? I'd put in 2000$ as a starter!