reftests: Enforce default settings

Set all settings to their default values, so we
are less dependent on the environment to be set
up just right. In particular, this fixes animations
being disabled when we happen to run in a vm.

testsuite/reftests/gtk-reftest.c

@@ -368,6 +368,40 @@ add_test_for_file (GFile *file)
   g_list_free_full (files, g_object_unref);
 }
 
+static void
+enforce_default_settings (void)
+{
+  GtkSettings *settings;
+  GTypeClass *klass;
+  GParamSpec **pspecs;
+  guint n_pspecs;
+  int i;
+
+  settings = gtk_settings_get_default ();
+
+  klass = g_type_class_ref (G_OBJECT_TYPE (settings));
+
+  pspecs = g_object_class_list_properties (klass, &n_pspecs);
+  for (i = 0; i < n_pspecs; i++)
+    {
+      GParamSpec *pspec = pspecs[i];
+      const GValue *value;
+
+      if ((pspec->flags & G_PARAM_WRITABLE) == 0)
+        continue;
+
+      if (pspec->value_type == G_TYPE_HASH_TABLE)
+        continue;
+
+      value = g_param_spec_get_default_value (pspec);
+      g_object_set_property (settings, pspec->name, value);
+    }
+
+  g_free (pspecs);
+
+  g_type_class_unref (klass);
+}
+
 int
 main (int argc, char **argv)
 {
@@ -382,6 +416,8 @@ main (int argc, char **argv)
   if (!parse_command_line (&argc, &argv))
     return 1;
 
+  enforce_default_settings ();
+
   if (arg_base_dir)
     basedir = arg_base_dir;
   else