[gtk-doc] scangobj: Protect style property inspection

[Stefan Sauer <stefkost src gnome org>]

commit 5bd7638ba5c521d82f148a4f4a6c030951f5eeb7
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Feb 13 21:23:04 2017 +0000

    scangobj: Protect style property inspection
    
    The API to list style properties on GtkWidget was removed in GTK+ 3.89.
    
    We need to protect the call to gtk_widget_class_list_style_properties()
    with a version check.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778144

 gtkdoc-scangobj.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtkdoc-scangobj.in b/gtkdoc-scangobj.in
index 0fb3c2e..a2d91b0 100644
--- a/gtkdoc-scangobj.in
+++ b/gtkdoc-scangobj.in
@@ -1270,7 +1270,7 @@ output_object_args (FILE *fp, GType object_type)
 #endif
 
 #ifdef GTK_IS_WIDGET_CLASS
-#if GTK_CHECK_VERSION(2,1,0)
+#if GTK_CHECK_VERSION(2,1,0) && !GTK_CHECK_VERSION(3,89,2)
     if (!style_prop && GTK_IS_WIDGET_CLASS (class)) {
       properties = gtk_widget_class_list_style_properties (GTK_WIDGET_CLASS (class), &n_properties);
       style_prop = TRUE;