sub-line-spacing should be allowed to be negative

[luiscastro193]

mpv Information

mpv v0.39.0-635-g20375d1133 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Jan 24 2025 09:40:54
libplacebo version: v7.350.0 (v7.349.0-30-g056b8520-dirty)
FFmpeg version: N-118350-ge20ee9f9ae
FFmpeg library versions:
   libavcodec      61.31.101
   libavdevice     61.4.100
   libavfilter     10.6.101
   libavformat     61.9.106
   libavutil       59.55.100
   libswresample   5.4.100
   libswscale      8.13.100

Other Information

- Linux version: Arch
- Kernel Version:
- GPU Model:
- Mesa/GPU Driver Version:
- Window Manager and Version:
- Source of mpv: git
- Latest known working version: Yesterday's build
- Issue started after the following happened: Some recent commit

Reproduction Steps

Set sub-line-spacing to -15.

Expected Behavior

The renderer used to draw the lines closer together.

Actual Behavior

The option is ignored and the following error is printed:

The sub-line-spacing option is out of range: -15
Error parsing option sub-line-spacing (parameter is outside values allowed for option)

Log File

output.txt

Sample Files

No response

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.