[Sway] when setting a geometry and then setting a rule to be floating the window force different size

[akrram09]

mpv Information

mpv v0.39.0-dirty Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Mar 13 2025 08:13:20
libplacebo version: v7.349.0
FFmpeg version: n7.1
FFmpeg library versions:
   libavcodec      61.19.100
   libavdevice     61.3.100
   libavfilter     10.4.100
   libavformat     61.7.100
   libavutil       59.39.100
   libswresample   5.3.100
   libswscale      8.3.100

Other Information

- Linux version: Arch Linux
- Kernel Version: Linux arch 6.13.8-arch1-1 #1 SMP PREEMPT_DYNAMIC Sun, 23 Mar 2025 17:17:30 +0000 x86_64 GNU/Linux

- GPU Model: 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 620 [8086:5916] (rev 02)

- Mesa/GPU Driver Version: Mesa 25.0.2-arch1.2
- Window Manager and Version: swayfx version 0.5 (based on sway 1.10.1)
- Source of mpv: pacman
- Issue started after the following happened: on my 1920x1080 (scale set to 1.5) the mpv window looks so small, so i try to do geometry and it works but when setting a rule for mpv to be floating, it opens in different size then the one i set, but when no rule set for example its in tiling mode then press $mod+Shift+space to be floating it works

Reproduction Steps

1. place the following in mpv.conf
   geometry=1400x788
2. add a rule to sway to be floating
   for_window [app_id="mpv"] floating enable
3. open mpv
4. see bug

Expected Behavior

the window follow the geometry and also fix the size problem on 1920x1080 displays
(default no rules no geometry)

Actual Behavior

the window doesn't follow geometry when setting a rule

Log File

output.txt

Sample Files

geometry=1400x788

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

[llyyr]

I can't reproduce on sway

[akrram09]

I can't reproduce on sway

did you set a rule in sway config to be floating because that whats causes the problem?

[llyyr]

did you set a rule in sway config to be floating because that whats causes the problem?

Yes

[Dudemanguy]

There's a rounding error but everything is working according to your log.

[ 0.146][v][vo/gpu/wayland] Resizing due to xdg from 1400x788 to 1401x789

I also can't reproduce on my end. Are you certain the dimensions are actually incorrect?

[akrram09]

I switched back to normal version of sway (i was on swayfx) and problem still occur and i noticed when setting a scale for my screen this problem happens but when removing it it works fine and geometry correct

I also can't reproduce on my end. Are you certain the dimensions are actually incorrect?

yup, when opening mpv it resizes itself

[llyyr]

Is it correct if you set hidpi-window-scale?

[akrram09]

fixed it thank you so much, but why is the geometry soo weird like my terminal size set to 700x400 but i need to set mpv to 1400x768 to be the same size as my terminal, is this an issue or what?

[Dudemanguy]

This sounds like a bug. In theory, it should not matter regardless of hidpi-window-scale or not because --geometry will always set the exact pixel size or is supposed to anyway. I still can't reproduce on my end and your log looks fine so I have no idea what is happening.

[llyyr]

Provide output of WAYLAND_DEBUG=1 maybe, should be more useful in this case than mpv's own logs

[akrram09]

logs.txt

[junething]

I have a similar issue on chromium app mode.
if you set

for_window [title="Index of /"] floating enable

in your sway config and then run

chromium --window-size=400,400 --app=file://

The window is not 400x400 but much larger, however if you toggle floating mode, the window goes back to the correct size.