[gtk/wip/exalm/test: 1/37] tests: Fix print-editor

[Alexander Mikhaylenko <alexm src gnome org>]

commit b7bfb29ae8bbf651a8583eeaab52c3f0fa3f85ae
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon May 11 01:59:25 2020 +0500

    tests: Fix print-editor
    
    Don't assume GtkWindow is a container.

 tests/print-editor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tests/print-editor.c b/tests/print-editor.c
index a0a8fde4ee..646f3fe93f 100644
--- a/tests/print-editor.c
+++ b/tests/print-editor.c
@@ -748,7 +748,7 @@ activate (GApplication *app)
   update_title (GTK_WINDOW (main_window));
 
   box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
-  gtk_container_add (GTK_CONTAINER (main_window), box);
+  gtk_window_set_child (GTK_WINDOW (main_window), box);
 
   /* Create document  */
   sw = gtk_scrolled_window_new (NULL, NULL);