[gtk/expander-demo-fix] gtk-demo: Make the expander demo behave again

[Matthias Clasen <matthiasc src gnome org>]

commit 0d2a7f876b5c6602c3c20112e1c4b16745b4a345
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 1 21:12:36 2019 +0000

    gtk-demo: Make the expander demo behave again
    
    Changes to the dialog hierarchy have affected
    this demo, that admittedly pokes at message
    dialog internals. Do that some more, to fix
    things up.

 demos/gtk-demo/expander.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/demos/gtk-demo/expander.c b/demos/gtk-demo/expander.c
index c7deb3b2c8..c54f9feec2 100644
--- a/demos/gtk-demo/expander.c
+++ b/demos/gtk-demo/expander.c
@@ -31,6 +31,7 @@ do_expander (GtkWidget *do_widget)
   GtkWidget *toplevel;
   GtkWidget *area;
   GtkWidget *expander;
+  GtkWidget *label;
   GtkWidget *sw;
   GtkWidget *tv;
   GtkTextBuffer *buffer;
@@ -50,13 +51,19 @@ do_expander (GtkWidget *do_widget)
 
       area = gtk_message_dialog_get_message_area (GTK_MESSAGE_DIALOG (window));
 
+      label = gtk_widget_get_last_child (area);
+      gtk_label_set_line_wrap (GTK_LABEL (label), FALSE);
+      gtk_widget_set_vexpand (label, FALSE);
+
       expander = gtk_expander_new ("Details:");
+      gtk_widget_set_vexpand (expander, TRUE);
       sw = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_min_content_height (GTK_SCROLLED_WINDOW (sw), 100);
       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw), GTK_SHADOW_IN);
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                       GTK_POLICY_NEVER,
                                       GTK_POLICY_AUTOMATIC);
+      gtk_scrolled_window_set_propagate_natural_height (GTK_SCROLLED_WINDOW (sw), TRUE);
 
       tv = gtk_text_view_new ();
       buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (tv));