Make BasePlayer.get[Next/Previous]WindowIndex more useful

When in REPEAT_MODE_ONE, it's unlikely apps want next/previous methods
on the player to keep them in the same window. Music apps in particular
tend to implement next/previous functionality as though repeat mode were
off when in this mode (i.e. current song loops forever during playback,
but next/previous navigation still navigates to next/previous items).

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=220469655

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

@@ -79,7 +79,7 @@ public abstract class BasePlayer implements Player {
     return timeline.isEmpty()
         ? C.INDEX_UNSET
         : timeline.getNextWindowIndex(
-            getCurrentWindowIndex(), getRepeatMode(), getShuffleModeEnabled());
+            getCurrentWindowIndex(), getRepeatModeForNavigation(), getShuffleModeEnabled());
   }
 
   @Override
@@ -88,7 +88,7 @@ public abstract class BasePlayer implements Player {
     return timeline.isEmpty()
         ? C.INDEX_UNSET
         : timeline.getPreviousWindowIndex(
-            getCurrentWindowIndex(), getRepeatMode(), getShuffleModeEnabled());
+            getCurrentWindowIndex(), getRepeatModeForNavigation(), getShuffleModeEnabled());
   }
 
   @Override
@@ -129,4 +129,10 @@ public abstract class BasePlayer implements Player {
         ? C.TIME_UNSET
         : timeline.getWindow(getCurrentWindowIndex(), window).getDurationMs();
   }
+
+  @RepeatMode
+  private int getRepeatModeForNavigation() {
+    @RepeatMode int repeatMode = getRepeatMode();
+    return repeatMode == REPEAT_MODE_ONE ? REPEAT_MODE_OFF : repeatMode;
+  }
 }