Improve track index adjustment logic by adding index comparison.

Author: jaeho-lee104

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/trackselection/AdaptiveTrackSelection.java

@@ -457,7 +457,8 @@ public void updateSelectedTrack(
       previousReason = Iterables.getLast(queue).trackSelectionReason;
     }
     int newSelectedIndex = determineIdealSelectedIndex(nowMs, chunkDurationUs);
-    if (!isTrackExcluded(previousSelectedIndex, nowMs)) {
+    if (newSelectedIndex != previousSelectedIndex
+        && !isTrackExcluded(previousSelectedIndex, nowMs)) {
       // Revert back to the previous selection if conditions are not suitable for switching.
       Format currentFormat = getFormat(previousSelectedIndex);
       Format selectedFormat = getFormat(newSelectedIndex);