From 05a6abd794de7891a2b8bdc0270800a68b72e033 Mon Sep 17 00:00:00 2001
From: Flavio Copes <copesc@gmail.com>
Date: Wed, 26 Jul 2017 02:54:58 +0200
Subject: [PATCH] If a form is already defined, do not override it (#1132)

Preserves form validation re
https://github.com/getgrav/grav-plugin-admin/issues/1129
---
 admin.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/admin.php b/admin.php
index b1a4fcab..a90e80d3 100644
--- a/admin.php
+++ b/admin.php
@@ -501,7 +501,10 @@ class AdminPlugin extends Plugin
         // add form if it exists in the page
         $header = $page->header();
         if (isset($header->form)) {
-            $twig->twig_vars['form'] = new Form($page);
+            // preserve form validation
+            if (!isset($twig->twig_vars['form'])) {
+                $twig->twig_vars['form'] = new Form($page);
+            }
         }
 
         // Gather Plugin-hooked nav items