docs: public static SARLPackageExplorerPart getFromActivePerspective() {
  		final IWorkbenchPage activePage = JavaPlugin.getActivePage();
  		if (activePage == null) {
  			return null;
  		}
  		final IViewPart view = activePage.findView(ID_PACKAGES);
  		if (view instanceof PackageExplorerPart) {
  			return (SARLPackageExplorerPart) view;
  		}
  		return null;
  	}