fix(FEC-12760): default track stream selected when config.playback.te…

…xtLanguage !== 'auto' - Regression (#688)

default track stream selected when config.playback.textLanguage !== 'auto' - Regression

src/player.js

@@ -2588,9 +2588,10 @@ export default class Player extends FakeEventTarget {
    */
   _setDefaultTracks(): void {
     const activeTracks = this.getActiveTracks();
+    const defaultStreamTrack = this._getTextTracks().find(track => track.default);
     const playbackConfig = this.config.playback;
     const offTextTrack: ?Track = this._getTextTracks().find(track => TextTrack.langComparer(OFF, track.language));
-    const defaultLanguage = this._getLanguage<TextTrack>(this._getTextTracks(), playbackConfig.textLanguage, activeTracks.text);
+    const defaultLanguage = this._getLanguage<TextTrack>(this._getTextTracks(), playbackConfig.textLanguage, defaultStreamTrack);
     const currentOrConfiguredTextLang =
       !this._playbackAttributesState.textLanguage || this._playbackAttributesState.textLanguage === OFF
         ? defaultLanguage
@@ -2625,19 +2626,18 @@ export default class Player extends FakeEventTarget {
    * @returns {string} - The track language to set by default.
    */
   _getLanguage<T: TextTrack | AudioTrack>(tracks: Array<T>, configuredLanguage: string, defaultTrack: ?T): string {
-    let autoSelectedLanguage: string = '';
-    const defaultStreamTrack: string = tracks.find(track => track.default)?.language || '';
-    if (configuredLanguage === AUTO) {
+    let language = configuredLanguage;
+    if (language === AUTO) {
       const localeTrack: ?T = tracks.find(track => Track.langComparer(Locale.language, track.language));
       if (localeTrack) {
-        autoSelectedLanguage = localeTrack.language;
+        language = localeTrack.language;
       } else if (defaultTrack && defaultTrack.language !== OFF) {
-        autoSelectedLanguage = defaultTrack.language;
+        language = defaultTrack.language;
       } else if (tracks && tracks.length > 0) {
-        autoSelectedLanguage = tracks[0].language;
+        language = tracks[0].language;
       }
     }
-    return autoSelectedLanguage || configuredLanguage || defaultStreamTrack;
+    return language;
   }
 
   /**