From 53cd10ae7792d2b465e6687a4b3e7f2a65a08c30 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Mon, 5 Sep 2022 09:24:09 +0200
Subject: xdg-shell: forbid loops in set_parent

These don't make sense. Add a protocol error for this case.

Signed-off-by: Simon Ser <contact@emersion.fr>
Closes: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/issues/105
---
 stable/xdg-shell/xdg-shell.xml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/stable/xdg-shell/xdg-shell.xml b/stable/xdg-shell/xdg-shell.xml
index 8c9804f..993c54a 100644
--- a/stable/xdg-shell/xdg-shell.xml
+++ b/stable/xdg-shell/xdg-shell.xml
@@ -608,6 +608,8 @@
     <enum name="error">
       <entry name="invalid_resize_edge" value="0" summary="provided value is
         not a valid variant of the resize_edge enum"/>
+      <entry name="invalid_parent" value="1"
+        summary="invalid parent toplevel"/>
     </enum>
 
     <request name="set_parent">
@@ -628,6 +630,10 @@
 	the now-unmapped surface. If the now-unmapped surface has no parent,
 	its children's parent is unset. If the now-unmapped surface becomes
 	mapped again, its parent-child relationship is not restored.
+
+	The parent toplevel must not be one of the child toplevel's
+	descendants, and the parent must be different from the child toplevel,
+	otherwise the invalid_parent protocol error is raised.
       </description>
       <arg name="parent" type="object" interface="xdg_toplevel" allow-null="true"/>
     </request>
-- 
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