[gtk+] dialogs: always use CSD on dialogs

[Matthias Clasen <matthiasc src gnome org>]

commit 322f6c740f631abc24cc26fa2b81307eae18ef2c
Author: William Jon McCann <william jon mccann gmail com>
Date:   Thu Feb 27 14:19:32 2014 -0500

    dialogs: always use CSD on dialogs
    
    If we aren't using a header bar then put a fake titlebar
    box on it so we can round the corners.
    
    One of the advantages of this is so that the styling of the dialog
    is completely within one theme framework. This prevents skew between
    the theming expectations from the window manager and GTK+.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=725345

 gtk/gtkdialog.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkdialog.c b/gtk/gtkdialog.c
index 8e5797f..37d9bf0 100644
--- a/gtk/gtkdialog.c
+++ b/gtk/gtkdialog.c
@@ -279,7 +279,18 @@ apply_use_header_bar (GtkDialog *dialog)
   gtk_widget_set_visible (priv->action_area, !priv->use_header_bar);
   gtk_widget_set_visible (priv->headerbar, priv->use_header_bar);
   if (!priv->use_header_bar)
-    gtk_window_set_titlebar (GTK_WINDOW (dialog), NULL);
+    {
+      GtkWidget *box = NULL;
+
+      if (gtk_window_get_type_hint (GTK_WINDOW (dialog)) == GDK_WINDOW_TYPE_HINT_DIALOG)
+        {
+          box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+          gtk_widget_show (box);
+          gtk_widget_set_size_request (box, -1, 16);
+        }
+
+      gtk_window_set_titlebar (GTK_WINDOW (dialog), box);
+    }
   if (priv->use_header_bar)
     g_signal_connect (priv->action_area, "add", G_CALLBACK (add_cb), dialog);
 }