remote-desktop, screen-cast: Add version number to D-Bus APIs

In order to let applications gracefully handle version mismatches, add
a version property to the APIs. Also add a warning on the APIs that
these are not meant for public consumption.

src/backends/meta-remote-desktop.c

@@ -42,6 +42,7 @@
 
 #define META_REMOTE_DESKTOP_DBUS_SERVICE "org.gnome.Mutter.RemoteDesktop"
 #define META_REMOTE_DESKTOP_DBUS_PATH "/org/gnome/Mutter/RemoteDesktop"
+#define META_REMOTE_DESKTOP_API_VERSION 1
 
 typedef enum _MetaRemoteDesktopDeviceTypes
 {
@@ -262,6 +263,9 @@ meta_remote_desktop_init (MetaRemoteDesktop *remote_desktop)
   meta_dbus_remote_desktop_set_supported_device_types (
     META_DBUS_REMOTE_DESKTOP (remote_desktop),
     calculate_supported_device_types ());
+  meta_dbus_remote_desktop_set_version (
+    META_DBUS_REMOTE_DESKTOP (remote_desktop),
+    META_REMOTE_DESKTOP_API_VERSION);
 }
 
 static void

src/backends/meta-screen-cast.c

@@ -32,6 +32,7 @@
 
 #define META_SCREEN_CAST_DBUS_SERVICE "org.gnome.Mutter.ScreenCast"
 #define META_SCREEN_CAST_DBUS_PATH "/org/gnome/Mutter/ScreenCast"
+#define META_SCREEN_CAST_API_VERSION 1
 
 struct _MetaScreenCast
 {
@@ -264,6 +265,9 @@ meta_screen_cast_init (MetaScreenCast *screen_cast)
       pw_init (NULL, NULL);
       is_pipewire_initialized = TRUE;
     }
+
+  meta_dbus_screen_cast_set_version (META_DBUS_SCREEN_CAST (screen_cast),
+                                     META_SCREEN_CAST_API_VERSION);
 }
 
 static void

src/org.gnome.Mutter.RemoteDesktop.xml

@@ -6,6 +6,10 @@
   <!--
       org.gnome.Mutter.RemoteDesktop:
       @short_description: Remote desktop interface
+
+      This API is private and not intended to be used outside of the integrated
+      system that uses libmutter. No compatibility between versions are
+      promised.
   -->
   <interface name="org.gnome.Mutter.RemoteDesktop">
 
@@ -28,6 +32,12 @@
     -->
     <property name="SupportedDeviceTypes" type="u" access="read" />
 
+    <!--
+	Version:
+	@short_description: API version
+    -->
+    <property name="Version" type="i" access="read" />
+
   </interface>
 
   <!--

src/org.gnome.Mutter.ScreenCast.xml

@@ -6,6 +6,10 @@
   <!--
       org.gnome.Mutter.ScreenCast:
       @short_description: Screen cast interface
+
+      This API is private and not intended to be used outside of the integrated
+      system that uses libmutter. No compatibility between versions are
+      promised.
   -->
   <interface name="org.gnome.Mutter.ScreenCast">
 
@@ -24,6 +28,12 @@
       <arg name="session_path" type="o" direction="out" />
     </method>
 
+    <!--
+        Version:
+        @short_description: API version
+    -->
+    <property name="Version" type="i" access="read" />
+
   </interface>
 
   <!--