[glade/glade-3-20] GladeGtkDialog: chain up post_create() method

[Juan Pablo Ugarte <jpu src gnome org>]

commit 63b90c142f2da331bd0007340affff8c25b96c8f
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Sat Mar 24 13:24:05 2018 -0300

    GladeGtkDialog: chain up post_create() method
    
    GtkWindow adaptor handles use-csd property

 plugins/gtk+/glade-gtk-dialog.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/plugins/gtk+/glade-gtk-dialog.c b/plugins/gtk+/glade-gtk-dialog.c
index ce9f847..06a1ca3 100644
--- a/plugins/gtk+/glade-gtk-dialog.c
+++ b/plugins/gtk+/glade-gtk-dialog.c
@@ -70,6 +70,9 @@ glade_gtk_dialog_post_create (GladeWidgetAdaptor *adaptor,
   GladeWidget *widget, *vbox_widget, *actionarea_widget;
   GtkDialog *dialog;
 
+  /* Chain Up first */
+  GWA_GET_CLASS (GTK_TYPE_WINDOW)->post_create (adaptor, object, reason);
+
   g_return_if_fail (GTK_IS_DIALOG (object));
 
   widget = glade_widget_get_from_gobject (GTK_WIDGET (object));