Renders the ‘core/widget-group’ block.

function render_block_core_widget_group( $attributes, $content, $block ) {
	global $wp_registered_sidebars, $_sidebar_being_rendered;

	if ( isset( $wp_registered_sidebars[ $_sidebar_being_rendered ] ) ) {
		$before_title = $wp_registered_sidebars[ $_sidebar_being_rendered ]['before_title'];
		$after_title  = $wp_registered_sidebars[ $_sidebar_being_rendered ]['after_title'];
	} else {
		$before_title = '
';
		$after_title  = '
';
	}

	$html = '';

	if ( ! empty( $attributes['title'] ) ) {
		$html .= $before_title . esc_html( $attributes['title'] ) . $after_title;
	}

	$html .= '
';
	foreach ( $block->inner_blocks as $inner_block ) {
		$html .= $inner_block->render();
	}
	$html .= '
';

	return $html;
}