Improve DefaultLoadControl.shouldContinueLoading for the minBuffer=maxBuffer case.

Currently no path may be chosen if
minBufferUs == maxBufferUs == bufferedDurationUs.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=221639199

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

@@ -385,7 +385,7 @@ public class DefaultLoadControl implements LoadControl {
     }
     if (bufferedDurationUs < minBufferUs) {
       isBuffering = prioritizeTimeOverSizeThresholds || !targetBufferSizeReached;
-    } else if (bufferedDurationUs > maxBufferUs || targetBufferSizeReached) {
+    } else if (bufferedDurationUs >= maxBufferUs || targetBufferSizeReached) {
       isBuffering = false;
     } // Else don't change the buffering state
     if (priorityTaskManager != null && isBuffering != wasBuffering) {

library/core/src/test/java/com/google/android/exoplayer2/DefaultLoadControlTest.java

@@ -48,15 +48,15 @@ public class DefaultLoadControlTest {
     createDefaultLoadControl();
     assertThat(loadControl.shouldContinueLoading(/* bufferedDurationUs= */ 0, SPEED)).isTrue();
     assertThat(loadControl.shouldContinueLoading(MIN_BUFFER_US, SPEED)).isTrue();
-    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US, SPEED)).isTrue();
-    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US + 1, SPEED)).isFalse();
+    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US - 1, SPEED)).isTrue();
+    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US, SPEED)).isFalse();
   }
 
   @Test
   public void testShouldNotContinueLoadingOnceBufferingStopped_untilBelowMinBuffer() {
     createDefaultLoadControl();
-    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US + 1, SPEED)).isFalse();
     assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US, SPEED)).isFalse();
+    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US - 1, SPEED)).isFalse();
     assertThat(loadControl.shouldContinueLoading(MIN_BUFFER_US, SPEED)).isFalse();
     assertThat(loadControl.shouldContinueLoading(MIN_BUFFER_US - 1, SPEED)).isTrue();
   }
@@ -69,7 +69,7 @@ public class DefaultLoadControlTest {
     assertThat(loadControl.shouldContinueLoading(/* bufferedDurationUs= */ 0, SPEED)).isTrue();
     assertThat(loadControl.shouldContinueLoading(MIN_BUFFER_US - 1, SPEED)).isTrue();
     assertThat(loadControl.shouldContinueLoading(MIN_BUFFER_US, SPEED)).isFalse();
-    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US + 1, SPEED)).isFalse();
+    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US, SPEED)).isFalse();
   }
 
   @Test
@@ -82,7 +82,7 @@ public class DefaultLoadControlTest {
 
     assertThat(loadControl.shouldContinueLoading(/* bufferedDurationUs= */ 0, SPEED)).isFalse();
     assertThat(loadControl.shouldContinueLoading(MIN_BUFFER_US, SPEED)).isFalse();
-    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US + 1, SPEED)).isFalse();
+    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US, SPEED)).isFalse();
   }
 
   @Test
@@ -100,7 +100,7 @@ public class DefaultLoadControlTest {
   public void testShouldNotContinueLoadingWithMaxBufferReached_inFastPlayback() {
     createDefaultLoadControl();
 
-    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US + 1, /* playbackSpeed= */ 100f))
+    assertThat(loadControl.shouldContinueLoading(MAX_BUFFER_US, /* playbackSpeed= */ 100f))
         .isFalse();
   }