demux_playlist: add only media files when opening directory

DOCS/interface-changes/directory-filter-types.txt

@@ -1 +1,2 @@
 add `--directory-filter-types`
+By default, opening a directory will create a playlist with only the media types "video, audio, image". To restore the previous behavior, use `--directory-filter-types-clr`.

DOCS/man/options.rst

@@ -4143,7 +4143,7 @@ Demuxer
 
 ``--directory-filter-types=<video,audio,image>``
     Media file types to filter when opening directory. If the list is empty,
-    all files are added to the playlist.
+    all files are added to the playlist. (Default: ``video,audio,image``)
 
     This is a string list option. See `List Options`_ for details.
 

demux/demux_playlist.c

@@ -71,7 +71,7 @@ struct m_sub_options demux_playlist_conf = {
     .defaults = &(const struct demux_playlist_opts){
         .dir_mode = DIR_AUTO,
         .directory_filter = (char *[]){
-            NULL
+            "video", "audio", "image", NULL
         },
     },
 };