Follow-up Comment #9, bug #24844 (project freeciv):
"Any callback set by Mix_HookMusicFinished will be called when the music
finishes fading out" in
https://www.libsdl.org/projects/SDL_mixer/docs/SDL_mixer_68.html#SEC68 sounds
interesting, because sdl_audio_stop() in audio_sdl.c is a
Mix_FadeOutMusic(2000).
There's a 100ms sdl_audio_wait() loop while Mix_Playing(-1), with an also
interesting warning: "WARNING: If a channel is looping, it will NEVER exit!
Always call music_stop() first!".
If that's stop_menu_music() or stop_style_muxic() in music.c it only calls
audio_stop() in audio.c, and that's audio_sdl.c sdl_audio_stop() handled as
the Mix_FadeOutMusic(2000).
Sooner *or later+ the delay loop will end at a point in time when
Mix_Playing(-1) = 0, and sdl_audio_shutdown() can finish the job. Are we
talking about *or later* here?
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