IDEA-89417 Editor: Avoid VCS hint paint artifacts

Looks like the problem is that editor scroll animator has enough time to tick before paint request scheduled by the DirtyRegionManager is actually executed

platform/platform-impl/src/com/intellij/ui/LightweightHint.java

@@ -366,7 +366,7 @@ public class LightweightHint extends UserDataHolderBase implements Hint {
               LayoutFocusTraversalPolicyExt.setOverridenDefaultComponent(null);
             }
 
-            layeredPane.repaint(bounds.x, bounds.y, bounds.width, bounds.height);
+            layeredPane.paintImmediately(bounds.x, bounds.y, bounds.width, bounds.height);
           }
         }
       }