Ticket #31071: 31071.5.diff

src/wp-includes/media.php

@@ -3324 +3324 @@
         /**
          * Allows showing or hiding the "Create Audio Playlist" button in the media library.
          *
-         * By default (if this filter returns `null`), a query will be run to
-         * determine whether the media library contains any audio items.  This
-         * query is expensive for large media libraries, so it may be desirable for
-         * sites to override this behavior.
+         * By default, the "Create Audio Playlist" button will always be shown in
+         * the media library.  If this filter returns `null`, a query will be run
+         * to determine whether the media library contains any audio items.  This
+         * was the default behavior prior to version 4.8.0, but this query is
+         * expensive for large media libraries.
          *
          * @since 4.7.4
+         * @since 4.8.0 The filter's default value is `true` rather than `null`.
          *
          * @link https://core.trac.wordpress.org/ticket/31071
          *
-         * @param bool|null Whether to show the button, or `null` for default behavior.
+         * @param bool|null Whether to show the button, or `null` to decide based
+         *                  on whether any audio files exist in the media library.
          */
-        $show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', null );
+        $show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true );
         if ( null === $show_audio_playlist ) {
                 $show_audio_playlist = $wpdb->get_var( "
                         SELECT ID
@@ -3349 +3352 @@
         /**
          * Allows showing or hiding the "Create Video Playlist" button in the media library.
          *
-         * By default (if this filter returns `null`), a query will be run to
-         * determine whether the media library contains any video items.  This
-         * query is expensive for large media libraries, so it may be desirable for
-         * sites to override this behavior.
+         * By default, the "Create Video Playlist" button will always be shown in
+         * the media library.  If this filter returns `null`, a query will be run
+         * to determine whether the media library contains any video items.  This
+         * was the default behavior prior to version 4.8.0, but this query is
+         * expensive for large media libraries.
          *
          * @since 4.7.4
+         * @since 4.8.0 The filter's default value is `true` rather than `null`.
          *
          * @link https://core.trac.wordpress.org/ticket/31071
          *
-         * @param bool|null Whether to show the button, or `null` for default behavior.
+         * @param bool|null Whether to show the button, or `null` to decide based
+         *                  on whether any video files exist in the media library.
          */
-        $show_video_playlist = apply_filters( 'media_library_show_video_playlist', null );
+        $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true );
         if ( null === $show_video_playlist ) {
                 $show_video_playlist = $wpdb->get_var( "
                         SELECT ID