Merge pull request #7467 from open-sausages/pulls/4.0/adjust-field-onbeforerender

Adjust FormField::onBeforeRendor so that it can influence both context and passed properties

src/Forms/FormField.php

@@ -978,12 +978,12 @@ class FormField extends RequestHandler
     {
         $context = $this;
 
+        $this->extend('onBeforeRender', $context, $properties);
+
         if (count($properties)) {
             $context = $context->customise($properties);
         }
 
-        $this->extend('onBeforeRender', $this);
-
         $result = $context->renderWith($this->getTemplates());
 
         // Trim whitespace from the result, so that trailing newlines are supressed. Works for strings and HTMLText values