Update HLS window duration with trailing parts.

If we have trailing parts the available window should reach to
the end of all trailing parts and not only to the last finished
segment.

Issue: #5011
PiperOrigin-RevId: 347996626

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaSource.java

@@ -536,7 +536,6 @@ public final class HlsMediaSource extends BaseMediaSource
       } else if (windowDefaultStartPositionUs == C.TIME_UNSET) {
         windowDefaultStartPositionUs = 0;
       }
-
       timeline =
           new SinglePeriodTimeline(
               presentationStartTimeMs,

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/playlist/HlsMediaPlaylist.java

@@ -25,6 +25,7 @@ import com.google.android.exoplayer2.drm.DrmInitData;
 import com.google.android.exoplayer2.offline.StreamKey;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Iterables;
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -475,9 +476,12 @@ public final class HlsMediaPlaylist extends HlsPlaylist {
     this.skippedSegmentCount = skippedSegmentCount;
     this.trailingParts = ImmutableList.copyOf(trailingParts);
     this.renditionReports = ImmutableMap.copyOf(renditionReports);
-    if (!segments.isEmpty()) {
-      Segment last = segments.get(segments.size() - 1);
-      durationUs = last.relativeStartTimeUs + last.durationUs;
+    if (!trailingParts.isEmpty()) {
+      Part lastPart = Iterables.getLast(trailingParts);
+      durationUs = lastPart.relativeStartTimeUs + lastPart.durationUs;
+    } else if (!segments.isEmpty()) {
+      Segment lastSegment = Iterables.getLast(segments);
+      durationUs = lastSegment.relativeStartTimeUs + lastSegment.durationUs;
     } else {
       durationUs = 0;
     }