Make renderer flush when setting pause-at-end more targeted.

We currently always reset everything if playingPeriod != readingPeriod.
However, this is only needed when the pausing is actually required, i.e.,
if the feature is enabled and we are in the last period of the window.

PiperOrigin-RevId: 328141242

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java

@@ -733,12 +733,14 @@ import java.util.concurrent.atomic.AtomicBoolean;
   private void setPauseAtEndOfWindowInternal(boolean pauseAtEndOfWindow)
   private void setPauseAtEndOfWindowInternal(boolean pauseAtEndOfWindow)
       throws ExoPlaybackException {
       throws ExoPlaybackException {
     this.pauseAtEndOfWindow = pauseAtEndOfWindow;
     this.pauseAtEndOfWindow = pauseAtEndOfWindow;
-    if (queue.getReadingPeriod() != queue.getPlayingPeriod()) {
-      seekToCurrentPosition(/* sendDiscontinuity= */ true);
-    }
     resetPendingPauseAtEndOfPeriod();
     resetPendingPauseAtEndOfPeriod();
+    if (pendingPauseAtEndOfPeriod && queue.getReadingPeriod() != queue.getPlayingPeriod()) {
+      // When pausing is required, we need to set the streams of the playing period final. If we
+      // already started reading the next period, we need to flush the renderers.
+      seekToCurrentPosition(/* sendDiscontinuity= */ true);
       handleLoadingMediaPeriodChanged(/* loadingTrackSelectionChanged= */ false);
       handleLoadingMediaPeriodChanged(/* loadingTrackSelectionChanged= */ false);
     }
     }
+  }
 
 
   private void setOffloadSchedulingEnabledInternal(boolean offloadSchedulingEnabled) {
   private void setOffloadSchedulingEnabledInternal(boolean offloadSchedulingEnabled) {
     if (offloadSchedulingEnabled == this.offloadSchedulingEnabled) {
     if (offloadSchedulingEnabled == this.offloadSchedulingEnabled) {