options: set subs-with-matching-audio to off by default

This means that subtitles won't be displayed unless the user asks for them

DOCS/interface-changes.rst

@@ -78,6 +78,7 @@ Interface changes
     - remove the `--tone-mapping-crosstalk` option
     - add `--gamut-mapping-mode=perceptual|relative|saturation|absolute|linear`
     - add `--corner-rounding` option
+    - change `--subs-with-matching-audio` default from `yes` to `no`
  --- mpv 0.35.0 ---
     - add the `--vo=gpu-next` video output driver, as well as the options
       `--allow-delayed-peak-detect`, `--builtin-scalers`,

DOCS/man/options.rst

@@ -136,9 +136,8 @@ Track Selection
     referenced tracks are always selected.
 
 ``--subs-with-matching-audio=<yes|no>``
-    When autoselecting a subtitle track, select a non-forced one even if the selected
-    audio stream matches your preferred subtitle language (default: yes). Disable this
-    if you'd like to only show subtitles for foreign audio or onscreen text.
+    When autoselecting a subtitle track, select a full/non-forced one even if the selected
+    audio stream matches your preferred subtitle language (default: no).
 
 
 Playback Control

options/options.c

@@ -1031,7 +1031,7 @@ static const struct MPOpts mp_default_opts = {
                      [STREAM_VIDEO] = -2,
                      [STREAM_SUB] = -2, }, },
     .stream_auto_sel = true,
-    .subs_with_matching_audio = true,
+    .subs_with_matching_audio = false,
     .audio_display = 1,
     .audio_output_format = 0,  // AF_FORMAT_UNKNOWN
     .playback_speed = 1.,