Add title attribute to button for Request panel with extra query var

dispatchers/Html.php

@@ -522,9 +522,14 @@ protected function before_output() {
 	 * @return void
 	 */
 	protected function do_panel_menu_item( $id, array $menu ) {
+		if ( empty( $menu['attr-title'] ) ) {
+			$menu['attr-title'] = '';
+		}
+
 		printf(
-			'<li role="presentation"><button role="tab" data-qm-href="%1$s">%2$s</button>',
+			'<li role="presentation"><button role="tab" data-qm-href="%1$s" title="%2$s">%3$s</button>',
 			esc_attr( $menu['href'] ),
+			esc_attr( $menu['attr-title'] ),
 			esc_html( $menu['title'] )
 		);
 

output/html/request.php

@@ -224,11 +224,20 @@ public function admin_menu( array $menu ) {
 			/* translators: %s: Number of additional query variables */
 			: __( 'Request (+%s)', 'query-monitor' );
 
+		$attr_title = ( empty( $count ) )
+			? ''
+			/* translators: %s: Number of additional query variables */
+			: __( '+%s non-standard query variables in request. See Query Vars section.', 'query-monitor' );
+
 		$menu[ $this->collector->id() ] = $this->menu( array(
 			'title' => esc_html( sprintf(
 				$title,
 				number_format_i18n( $count )
 			) ),
+			'attr-title' => esc_html( sprintf(
+				$attr_title,
+				number_format_i18n( $count )
+			) ),
 		) );
 		return $menu;