@Override
  public void registerSource(@NotNull DnDSource source, @NotNull JComponent component, @NotNull Disposable parentDisposable) {
    registerSource(source, component);
    Disposer.register(parentDisposable, new Disposable() {
      @Override
      public void dispose() {
        unregisterSource(source, component);
      }
    });
  }
@Override
  public void registerSource(@NotNull DnDSource source, @NotNull JComponent component, @NotNull Disposable parentDisposable)