[gtk/wip/baedert/for-master] testwidgettransforms: Fix GtkBox casts

[Timm Bäder <baedert src gnome org>]

commit 7e19911d3f2c8a01e3843b713ed44dcf57e91e75
Author: Timm Bäder <mail baedert org>
Date:   Fri Jul 17 07:14:50 2020 +0200

    testwidgettransforms: Fix GtkBox casts

 tests/testwidgettransforms.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tests/testwidgettransforms.c b/tests/testwidgettransforms.c
index fb88488b16..0deca31e4f 100644
--- a/tests/testwidgettransforms.c
+++ b/tests/testwidgettransforms.c
@@ -320,7 +320,7 @@ main (int argc, char **argv)
   gtk_button_set_label (GTK_BUTTON (toggle_button), "Picking");
   gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle_button), do_picking);
   g_signal_connect (toggle_button, "toggled", G_CALLBACK (toggled_cb), NULL);
-  gtk_box_append (GTK_BOX (titlebar), toggle_button);
+  gtk_header_bar_pack_start (GTK_HEADER_BAR (titlebar), toggle_button);
 
   test_widget = gtk_button_new ();
   gtk_widget_set_size_request (test_widget, TEST_WIDGET_MIN_SIZE, TEST_WIDGET_MIN_SIZE);
@@ -332,7 +332,7 @@ main (int argc, char **argv)
   gtk_widget_set_halign (test_child, GTK_ALIGN_CENTER);
   gtk_widget_set_valign (test_child, GTK_ALIGN_CENTER);
   gtk_widget_set_size_request (test_child, TEST_WIDGET_MIN_SIZE / 2, TEST_WIDGET_MIN_SIZE / 2);
-  gtk_box_append (GTK_BOX (test_widget), test_child);
+  gtk_button_set_child (GTK_BUTTON (test_widget), test_child);
 
 
   gtk_transform_tester_set_test_widget (GTK_TRANSFORM_TESTER (transform_tester), test_widget);