remove .ended_ check from test, add comment in fastQualityChange

src/master-playlist-controller.js

@@ -531,8 +531,9 @@ export class MasterPlaylistController extends videojs.EventTarget {
     // in place to give the browser a kick to remove any cached frames from the
     // previous rendition
     this.mainSegmentLoader_.resetEverything(() => {
-      // We avoid the seekTo method here to prevent the buffering of segments from
-      // the previously enabled rendition before the new playlist has finished loading
+      // Since this is not a typical seek, we avoid the seekTo method which can cause
+      // segments from the previously enabled rendition to load before the new playlist
+      // has finished loading
       this.tech_.setCurrentTime(this.tech_.currentTime());
     });
 

test/master-playlist-controller.test.js

@@ -368,8 +368,6 @@ QUnit.test('resets everything for a fast quality change', function(assert) {
 
   this.masterPlaylistController.fastQualityChange_();
 
-  assert.equal(segmentLoader.ended_, false, 'segment loader ended property is false');
-
   assert.equal(resyncs, 1, 'resynced segment loader if media is changed');
 
   assert.equal(resets, 1, 'reseteverything event triggered if media is changed');