macosx/vlc_app/VLCMediaListLayer: Correctly go to the right layer.

projects/macosx/vlc_app/Sources/VLCMediaListLayer.m

@@ -215,6 +215,7 @@
         /* It is ok to scroll five layers */
         if( selectedIndex - index < 5  )
         {
+            while( index < selectedIndex  )
                 [self changeSelectedLayerToPreviousIndex];
             return;
         }
@@ -227,6 +228,7 @@
     {
         if( index - selectedIndex < 5  )
         {
+            while( index > selectedIndex  )
                 [self changeSelectedLayerToNextIndex];
             return;
         }