Source

File: wp-admin/includes/class-wp-ms-themes-list-table.php

public function single_row_columns( $item ) {
		list( $columns, $hidden, $sortable, $primary ) = $this->get_column_info();

		foreach ( $columns as $column_name => $column_display_name ) {
			$extra_classes = '';
			if ( in_array( $column_name, $hidden, true ) ) {
				$extra_classes .= ' hidden';
			}

			switch ( $column_name ) {
				case 'cb':
					echo '<th scope="row" class="check-column">';

					$this->column_cb( $item );

					echo '</th>';
					break;

				case 'name':
					$active_theme_label = '';

					/* The presence of the site_id property means that this is a subsite view and a label for the active theme needs to be added */
					if ( ! empty( $this->site_id ) ) {
						$stylesheet = get_blog_option( $this->site_id, 'stylesheet' );
						$template   = get_blog_option( $this->site_id, 'template' );

						/* Add a label for the active template */
						if ( $item->get_template() === $template ) {
							$active_theme_label = ' &mdash; ' . __( 'Active Theme' );
						}

						/* In case this is a child theme, label it properly */
						if ( $stylesheet !== $template && $item->get_stylesheet() === $stylesheet ) {
							$active_theme_label = ' &mdash; ' . __( 'Active Child Theme' );
						}
					}

					echo "<td class='theme-title column-primary{$extra_classes}'><strong>" . $item->display( 'Name' ) . $active_theme_label . '</strong>';

					$this->column_name( $item );

					echo '</td>';
					break;

				case 'description':
					echo "<td class='column-description desc{$extra_classes}'>";

					$this->column_description( $item );

					echo '</td>';
					break;

				case 'auto-updates':
					echo "<td class='column-auto-updates{$extra_classes}'>";

					$this->column_autoupdates( $item );

					echo '</td>';
					break;
				default:
					echo "<td class='$column_name column-$column_name{$extra_classes}'>";

					$this->column_default( $item, $column_name );

					echo '</td>';
					break;
			}
		}
	}