Add workaround for invalid buffering info on android

lib/src/helpers/utils.dart

@@ -34,6 +34,11 @@
   return formattedTime;
 }
 
+/// Get the current buffering state of the video player. Will invoke a
+/// Workaround for Android, as a bug in the video_player plugin prevents to get
+/// the actual buffering state, always returning true and breaking ui elements.
+/// For this, the actual buffer position is used to determine if the video is
+/// buffering or not. See #912 for more details.
 bool getIsBuffering(VideoPlayerController controller) {
   final VideoPlayerValue value = controller.value;
 
@@ -41,16 +46,16 @@
     if (value.isBuffering) {
       // -> Check if we actually buffer, as android has a bug preventing to
       //    get the correct buffering state from this single bool.
       final int position = value.position.inMilliseconds;
 
       // Special case, if the video is finished, we don't want to show the
       // buffering indicator anymore
       if (position >= value.duration.inMilliseconds) {
         return false;
       } else {
         final int buffer = value.buffered.lastOrNull?.end.inMilliseconds ?? -1;
 
         return position >= buffer;
       }
     } else {
       // -> No buffering
@@ -58,5 +63,5 @@
     }
   }
 
   return value.isBuffering;
 }