[gtkmm/gtkmm-3-24] demos: Fix minor bug at a call to Gtk::make_managed()

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 78bc93259b37a1df3fa1311d6c7f29b6fe82bbf1
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Nov 7 15:59:39 2018 +0100

    demos: Fix minor bug at a call to Gtk::make_managed()
    
    The newly introduced calls to make_managed() contained a bug.

 demos/gtk-demo/example_textview.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/example_textview.cc b/demos/gtk-demo/example_textview.cc
index 078c49aa..8ed3c04a 100644
--- a/demos/gtk-demo/example_textview.cc
+++ b/demos/gtk-demo/example_textview.cc
@@ -465,7 +465,7 @@ void Window_EasterEgg::recursive_attach_view(int depth, Gtk::TextView& view, Gli
   if (depth > 4)
     return;
 
-  Gtk::TextView* pChildView = Gtk::make_managed<Gtk::TextView(view.get_buffer>());
+  Gtk::TextView* pChildView = Gtk::make_managed<Gtk::TextView>(view.get_buffer());
 
   /* Frame is to add a black border around each child view */
   Gtk::Frame* pFrame = Gtk::make_managed<Gtk::Frame>();