From ecb2e8f33333214acf8185acc26869f27ec64803 Mon Sep 17 00:00:00 2001
From: Titus Kirch <titus.kirch@tkirch.dev>
Date: Wed, 30 Dec 2020 02:11:55 +0100
Subject: [PATCH] Support WysiwygFormContainer as children of
 ITabMenuFormContainer

---
 .../lib/system/form/builder/container/FormContainer.class.php  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/form/builder/container/FormContainer.class.php b/wcfsetup/install/files/lib/system/form/builder/container/FormContainer.class.php
index 008a3cda3b..ba164f9137 100644
--- a/wcfsetup/install/files/lib/system/form/builder/container/FormContainer.class.php
+++ b/wcfsetup/install/files/lib/system/form/builder/container/FormContainer.class.php
@@ -1,6 +1,7 @@
 <?php
 namespace wcf\system\form\builder\container;
 use wcf\data\IStorableObject;
+use wcf\system\form\builder\container\wysiwyg\WysiwygFormContainer;
 use wcf\system\form\builder\IFormChildNode;
 use wcf\system\form\builder\IFormDocument;
 use wcf\system\form\builder\TFormChildNode;
@@ -94,7 +95,7 @@ class FormContainer implements IFormContainer {
 		
 		if ($child instanceof ITabMenuFormContainer) {
 			$parent = $this;
-			while (!($parent instanceof IFormDocument) && $parent = $parent->getParent()) {
+			while (!($parent instanceof IFormDocument || $parent instanceof WysiwygFormContainer) && $parent = $parent->getParent()) {
 				if ($parent instanceof ITabMenuFormContainer) {
 					throw new \InvalidArgumentException("A tab menu container may only have another tab menu container as a parent, not as an earlier ancestor.");
 				}
-- 
2.20.1