def refresh(self, categories: list[str] | None = None) -> None:
        """
        Ask all or specified views to refresh based on changes in the underlying data and refresh the UI if needed. This
        may be called frequently so it must be extremely fast.

        :param categories:  Specify a list of view categories that should be reloaded.
        :return:            None
        """

        if categories is None:
            views = self.view_manager.views
        else:
            views = []
            for category in categories:
                views.extend(self.view_manager.views_by_category.get(category, []))

        for view in views:
            try:
                view.refresh()
            except Exception:  # pylint:disable=broad-except
                _l.warning("Exception occurred during reloading view %s.", view, exc_info=True)

        Ask all or specified views to refresh based on changes in the underlying data and refresh the UI if needed. This
        may be called frequently so it must be extremely fast.

        :param categories:  Specify a list of view categories that should be reloaded.
        :return:            None
        
angrmanagement/ui/workspace.py