From c925fae1801c04fce4e3e9b81cb380c5779fa4b5 Mon Sep 17 00:00:00 2001
From: Loz Calver <kinglozzer@gmail.com>
Date: Wed, 2 Nov 2022 10:02:42 +0000
Subject: [PATCH] NEW: Add onBeforeRender extension hook to Form

---
 src/Forms/Form.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Forms/Form.php b/src/Forms/Form.php
index c816c53f3..4d46f1fdb 100644
--- a/src/Forms/Form.php
+++ b/src/Forms/Form.php
@@ -1552,10 +1552,13 @@ class Form extends ViewableData implements HasRequestHandler
             HTTPCacheControlMiddleware::singleton()->disableCache();
         }
 
-        $return = $this->renderWith($this->getTemplates());
+        $context = $this;
+        $this->extend('onBeforeRender', $context);
+
+        $return = $context->renderWith($this->getTemplates());
 
         // Now that we're rendered, clear message
-        $this->clearMessage();
+        $context->clearMessage();
 
         return $return;
     }