Disabled auto-scrolling on library item expansion.

src/main/java/musicplayer/PlayerGUI.java

@@ -298,6 +298,7 @@ public class PlayerGUI implements PlayerCallbackInterface, LibraryCallbackInterf
         libraryView.setToggleClickCount(1);
         libraryView.setCellRenderer(new LibraryTreeCellRenderer());
         libraryView.addMouseListener(new LibraryMouseAdapter());
+        libraryView.setScrollsOnExpand(false);
         return libraryView;
     }