clutter: Make ClutterStageView a public class

As a compositor toolkit, it makes sense to allow consumers
of Clutter interact with the stage views themselves. As such,
ClutterStageView should be a public class.

As such, it is now included in clutter.h and should not be
included directly.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/623

clutter/clutter/clutter-stage-view.h

@@ -18,6 +18,10 @@
 #ifndef __CLUTTER_STAGE_VIEW_H__
 #define __CLUTTER_STAGE_VIEW_H__
 
+#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <clutter/clutter.h> can be included directly."
+#endif
+
 #include <cairo.h>
 #include <glib-object.h>
 #include <cogl/cogl.h>

clutter/clutter/clutter.h

@@ -101,6 +101,7 @@
 #include "clutter-snap-constraint.h"
 #include "clutter-stage.h"
 #include "clutter-stage-manager.h"
+#include "clutter-stage-view.h"
 #include "clutter-tap-action.h"
 #include "clutter-test-utils.h"
 #include "clutter-texture.h"

clutter/clutter/meson.build

@@ -75,6 +75,7 @@ clutter_headers = [
   'clutter-snap-constraint.h',
   'clutter-stage.h',
   'clutter-stage-manager.h',
+  'clutter-stage-view.h',
   'clutter-tap-action.h',
   'clutter-test-utils.h',
   'clutter-texture.h',
@@ -164,6 +165,7 @@ clutter_sources = [
   'clutter-snap-constraint.c',
   'clutter-stage.c',
   'clutter-stage-manager.c',
+  'clutter-stage-view.c',
   'clutter-stage-window.c',
   'clutter-tap-action.c',
   'clutter-test-utils.c',
@@ -207,7 +209,6 @@ clutter_private_headers = [
   'clutter-settings-private.h',
   'clutter-stage-manager-private.h',
   'clutter-stage-private.h',
-  'clutter-stage-view.h',
   'clutter-stage-view-private.h',
   'clutter-stage-window.h',
 ]
@@ -216,7 +217,6 @@ clutter_nonintrospected_sources = [
   'clutter-easing.c',
   'clutter-event-translator.c',
   'clutter-id-pool.c',
-  'clutter-stage-view.c',
 ]
 
 clutter_deprecated_headers = [