title: Android NotificationCompat.Builder works with three buttons but not four
body: <p>I have a notification which includes buttons to control a media player. As implemented below, everything works fine.</p>
  
  <pre><code>        Notification notification = builder
                  .setContentText(contentText)
                  .setSmallIcon(icon)
                  .setWhen(System.currentTimeMillis())
                  .setContentIntent(pendingIntent)
                  .setContentTitle(
                          getResources().getString(R.string.notification_title))
                  .addAction(R.drawable.ic_action_previous, "", previousPendingIntent)
                  // Adding this causes uglyness
  //              .addAction(R.drawable.ic_action_rewind20, "", jumpBackPendingIntent)
                  .addAction(playPauseIcon, "", playPausePendingIntent)
                  .addAction(R.drawable.ic_action_next, "", nextPendingIntent)
                  .build();
  
          NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
          mNotificationManager.notify(uniqueid, notification);
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/r6emW.jpg" alt="Working"></p>
  
  <p>However, when I comment out the line</p>
  
  <pre><code>.addAction(R.drawable.ic_action_rewind20, "", jumpBackPendingIntent)
  </code></pre>
  
  <p>The third buttons gets kicked out.</p>
  
  <p><img src="https://i.stack.imgur.com/6caL6.jpg" alt="Not Working"></p>
  
  <p>The <a href="https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#addAction(android.support.v4.app.NotificationCompat.Action)" rel="nofollow noreferrer">Android documentation on this</a> is pretty sparse. Nothing in the addAction docs implies that there's a limit. </p>
  
  <p>Clearly all of the buttons could fit in the notification. What am I missing?</p>
  
  <p><a href="https://github.com/smithdtyler/prettygoodmusicplayer/blob/jumpback/src/com/smithdtyler/prettygoodmusicplayer/MusicPlaybackService.java" rel="nofollow noreferrer">Full Source Code</a></p>