fix(HLS): Fix seekRange for EVENT playlist not using EXT-X-PLAYLIST-T…

…YPE (shaka-project#5220)

lib/hls/hls_parser.js

@@ -314,6 +314,9 @@ shaka.hls.HlsParser = class {
       this.presentationTimeline_.setDuration(Math.min(...maxTimestamps));
       this.playerInterface_.updateDuration();
     }
+    if (stillLive) {
+      this.determineDuration_();
+    }
   }
 
   /**
@@ -401,6 +404,8 @@ shaka.hls.HlsParser = class {
     const newestSegment = segments[segments.length - 1];
     goog.asserts.assert(newestSegment, 'Should have segments!');
 
+    streamInfo.maxTimestamp = newestSegment.endTime;
+
     // Once the last segment has been added to the playlist,
     // #EXT-X-ENDLIST tag will be appended.
     // If that happened, treat the rest of the EVENT presentation as VOD.
@@ -411,7 +416,6 @@ shaka.hls.HlsParser = class {
       // Flag this for later.  We don't convert the whole presentation into VOD
       // until we've seen the ENDLIST tag for all active playlists.
       streamInfo.hasEndList = true;
-      streamInfo.maxTimestamp = newestSegment.endTime;
     }
   }