[gtk/kill-containers] Use gtk_expander_set_child throughout

[Matthias Clasen <matthiasc src gnome org>]

commit 843f4d8f2d1a22c63d9efc1d6ca08dc5126fc83e
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 7 00:05:51 2020 -0400

    Use gtk_expander_set_child throughout
    
    Replace all uses of gtk_container_add on expanders
    with gtk_expander_set_child.

 tests/testexpander.c       | 2 +-
 tests/testflowbox.c        | 4 ++--
 tests/testgtk.c            | 2 +-
 tests/testscrolledwindow.c | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/tests/testexpander.c b/tests/testexpander.c
index a56cddd10d..e9d6e7b745 100644
--- a/tests/testexpander.c
+++ b/tests/testexpander.c
@@ -69,7 +69,7 @@ main (int argc, char *argv[])
                             "innuendo, just to make you scroll down or "
                             "resize the window. Do it already !", -1);
   gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), tv);
-  gtk_container_add (GTK_CONTAINER (expander), sw);
+  gtk_expander_set_child (GTK_EXPANDER (expander), sw);
   gtk_widget_set_hexpand (expander, TRUE);
   gtk_widget_set_vexpand (expander, TRUE);
   gtk_container_add (GTK_CONTAINER (area), expander);
diff --git a/tests/testflowbox.c b/tests/testflowbox.c
index f44cbed2d9..0b5386a214 100644
--- a/tests/testflowbox.c
+++ b/tests/testflowbox.c
@@ -423,7 +423,7 @@ create_window (void)
   flowbox_cntl = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
   gtk_widget_show (flowbox_cntl);
   gtk_widget_show (expander);
-  gtk_container_add (GTK_CONTAINER (expander), flowbox_cntl);
+  gtk_expander_set_child (GTK_EXPANDER (expander), flowbox_cntl);
   gtk_container_add (GTK_CONTAINER (vbox), expander);
 
   widget = gtk_check_button_new_with_label ("Homogeneous");
@@ -597,7 +597,7 @@ create_window (void)
   items_cntl = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
   gtk_widget_show (items_cntl);
   gtk_widget_show (expander);
-  gtk_container_add (GTK_CONTAINER (expander), items_cntl);
+  gtk_expander_set_child (GTK_EXPANDER (expander), items_cntl);
   gtk_container_add (GTK_CONTAINER (vbox), expander);
 
   /* Add Items control */
diff --git a/tests/testgtk.c b/tests/testgtk.c
index 8f0cfe22ec..d1f43498aa 100644
--- a/tests/testgtk.c
+++ b/tests/testgtk.c
@@ -2234,7 +2234,7 @@ create_expander (GtkWidget *widget)
 
       hidden = gtk_label_new ("Revealed!");
 
-      gtk_container_add (GTK_CONTAINER (expander), hidden);
+      gtk_expander_set_child (GTK_EXPANDER (expander), hidden);
     }
 
   if (!gtk_widget_get_visible (window))
diff --git a/tests/testscrolledwindow.c b/tests/testscrolledwindow.c
index 6ea0fa354e..36aa92c5e9 100644
--- a/tests/testscrolledwindow.c
+++ b/tests/testscrolledwindow.c
@@ -127,7 +127,7 @@ scrollable_policy (void)
   cntl = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
   gtk_widget_show (cntl);
   gtk_widget_show (expander);
-  gtk_container_add (GTK_CONTAINER (expander), cntl);
+  gtk_expander_set_child (GTK_EXPANDER (expander), cntl);
   gtk_container_add (GTK_CONTAINER (vbox), expander);
 
   /* Add Horizontal policy control here */