fix: Fix disable captions after load using src= on Safari (#8841)

Fixes #8840

---------

Co-authored-by: Theodore Abshire <[email protected]>

Author: avelad

lib/player.js

@@ -3319,7 +3319,13 @@ shaka.Player = class extends shaka.util.FakeEventTarget {
         this.loadEventManager_,
         () => {
           this.playhead_.ready();
-          fullyLoaded.resolve();
+          // We don't consider native HLS playback "fully loaded" until
+          // we have loaded the first frame. This gives the browser time
+          // to load caption information.
+          if (!this.mimeType_ ||
+              !shaka.util.MimeUtils.isHlsType(this.mimeType_)) {
+            fullyLoaded.resolve();
+          }
         });
 
     const waitForNativeTracks = () => {
@@ -3388,6 +3394,11 @@ shaka.Player = class extends shaka.util.FakeEventTarget {
           }
 
           this.setupPreferredTextOnSrc_();
+
+          if (this.mimeType_ &&
+              shaka.util.MimeUtils.isHlsType(this.mimeType_)) {
+            fullyLoaded.resolve();
+          }
         });
 
     if (mediaElement.error) {