desktop-shell: Make panel and background output dependent
diff --git a/protocol/desktop-shell.xml b/protocol/desktop-shell.xml
index d099925..fef6662 100644
--- a/protocol/desktop-shell.xml
+++ b/protocol/desktop-shell.xml
@@ -2,10 +2,12 @@
<interface name="desktop_shell" version="1">
<request name="set_background">
+ <arg name="output" type="object" interface="wl_output"/>
<arg name="surface" type="object" interface="wl_surface"/>
</request>
<request name="set_panel">
+ <arg name="output" type="object" interface="wl_output"/>
<arg name="surface" type="object" interface="wl_surface"/>
</request>