fix: HOOK_views_pre_render signature

views_style_matrixtable.module

@@ -287,7 +287,7 @@ function template_preprocess_views_style_matrixtable_view_matrixtable(&$variable
   unset($view->attach_before['matrix-data']);
 }
 
-function views_style_matrixtable_views_pre_render(&$view) {
+function views_style_matrixtable_views_pre_render($view) {
   $plugin = $view->getDisplay()->getPlugin('style');
   if ($plugin && $plugin->getPluginId() == 'matrix_table') {
     // you can add additional col / row / cell data in eg $view->attach_before['matrix-cols']