@Override
      public @Nullable Image startDropOver(@NotNull DockableContent<?> content, RelativePoint point) {
        myPaintDisposable = Disposer.newDisposable("GlassPaneListeners");
        myDropPainter = new WindowDropAreaPainter(frame);
        JComponent component = frame.getComponent();

        IdeGlassPaneUtil.find(component).addPainter(component, myDropPainter, myPaintDisposable);

        return null;
      }
@Override
      public @Nullable Image startDropOver(@NotNull DockableContent<?> content, RelativePoint point)