1. Make sure no XSETTINGS servers are running.
2. Set a theme name in ~/.gtkrc-2.0, for example:
   gtk-theme-name = "Industrial"
3. Run the following application.

  When gtk_init(NULL, NULL) is used, the theme returned is "Default".
  When gtk_init(&argc, &argv) is used, the theme returned is "Industrial".

The presence of arguments, even if blank, should not change how the RC files are
parsed.  This code breaks on GTK+ 2.6.0 but not on GTK+ 2.4 and earlier.

int main (int argc, char **argv)
{
    GtkSettings *settings;
    gchar *gtk_theme_name = 0;
    // WORKS: gtk_init (&argc, &argv);
    gtk_init (NULL, NULL);
    settings = gtk_settings_get_default ();
    g_object_get (settings, "gtk-theme-name", &gtk_theme_name, NULL);
    if (gtk_theme_name) fprintf (stdout, "  Theme is %s.\n", gtk_theme_name);
    return 0;
}