Update xdg-shell.xml

diff --git a/gdk/wayland/protocol/xdg-shell.xml b/gdk/wayland/protocol/xdg-shell.xml
index 6765f9841a77efb6a9d12e216a8d399924fc276e..e1249b06e192b04b788d776f438767908e6976b4 100644 (file)
--- a/gdk/wayland/protocol/xdg-shell.xml
+++ b/gdk/wayland/protocol/xdg-shell.xml
@@ -121,7 +121,7 @@
        unmapped if the parent is unmapped too. They should not appear
        on task bars and alt+tab.
       </description>
-      <arg name="parent" type="object" interface="wl_surface"/>
+      <arg name="parent" type="object" interface="wl_surface" allow-null="true"/>
     </request>
 
     <request name="set_title">