core: Replace gtk_get_default_locale usage

Clutter has an API to get the text direction but used to depend
on gtk3's translation domain. In order to avoid broken i18n
in case gtk3 is not installed, move the transtalable string to
clutter itself.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2407>

clutter/clutter/clutter-build-config.h.meson

@@ -1,3 +1,6 @@
+/* The prefix for our gettext translation domains. */
+#mesondefine GETTEXT_PACKAGE
+
 /* Mutter version */
 #mesondefine MUTTER_VERSION
 

clutter/clutter/clutter-main.c

@@ -50,6 +50,7 @@
 #include "clutter-build-config.h"
 
 #include <stdlib.h>
+#include <glib/gi18n-lib.h>
 
 #include "clutter-actor-private.h"
 #include "clutter-backend-private.h"
@@ -204,7 +205,7 @@ clutter_context_get_pango_fontmap (void)
   return self->font_map;
 }
 
-static ClutterTextDirection
+ClutterTextDirection
 clutter_get_text_direction (void)
 {
   ClutterTextDirection dir = CLUTTER_TEXT_DIRECTION_LTR;
@@ -220,8 +221,13 @@ clutter_get_text_direction (void)
     }
   else
     {
-      /* Re-use GTK+'s LTR/RTL handling */
-      const char *e = g_dgettext ("gtk30", "default:LTR");
+      /*
+       * Translate to default:RTL if you want your widgets
+       * to be RTL, otherwise translate to default:LTR.
+       * Do *not* translate it to "predefinito:LTR", if it
+       * it isn't default:LTR or default:RTL it will not work
+       */
+      const char *e = _("default:LTR");
 
       if (strcmp (e, "default:RTL") == 0)
         dir = CLUTTER_TEXT_DIRECTION_RTL;

clutter/clutter/clutter-main.h

@@ -148,6 +148,9 @@ void                    clutter_remove_debug_flags              (ClutterDebugFla
 CLUTTER_EXPORT
 void                    clutter_debug_set_max_render_time_constant (int max_render_time_constant_us);
 
+CLUTTER_EXPORT
+ClutterTextDirection    clutter_get_text_direction (void);
+
 G_END_DECLS
 
 #endif /* _CLUTTER_MAIN_H__ */

clutter/clutter/meson.build

@@ -267,6 +267,7 @@ clutter_built_private_headers = []
 
 cdata = configuration_data()
 cdata.set_quoted('MUTTER_VERSION', meson.project_version())
+cdata.set_quoted('GETTEXT_PACKAGE', meson.project_name())
 cdata.set('CLUTTER_DRIVERS', '"*"')
 cdata.set('HAVE_PANGO_FT2', have_pango_ft2)
 

po/POTFILES.in

@@ -11,6 +11,7 @@ src/backends/meta-input-settings.c
 src/backends/meta-monitor.c
 src/backends/meta-monitor-manager.c
 src/backends/x11/meta-clutter-backend-x11.c
+src/clutter/clutter/clutter-main.c
 src/compositor/compositor.c
 src/compositor/meta-background.c
 src/core/bell.c

src/core/util.c

@@ -508,11 +508,11 @@ meta_external_binding_name_for_action (guint keybinding_action)
 MetaLocaleDirection
 meta_get_locale_direction (void)
 {
-  switch (gtk_get_locale_direction ())
+  switch (clutter_get_text_direction ())
     {
-    case GTK_TEXT_DIR_LTR:
+    case CLUTTER_TEXT_DIRECTION_LTR:
       return META_LOCALE_DIRECTION_LTR;
-    case GTK_TEXT_DIR_RTL:
+    case CLUTTER_TEXT_DIRECTION_RTL:
       return META_LOCALE_DIRECTION_RTL;
     default:
       g_assert_not_reached ();