[gtk/kill-containers] Stop using container api on GtkFlowBox

[Matthias Clasen <matthiasc src gnome org>]

commit 96c132d6b04797c7d0082dfc9c7fbb4e71a987b6
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 7 23:24:58 2020 -0400

    Stop using container api on GtkFlowBox
    
    GtkContainer is going away.

 demos/gtk-demo/flowbox.c |  2 +-
 tests/testflowbox.c      | 21 +++++++--------------
 2 files changed, 8 insertions(+), 15 deletions(-)
---
diff --git a/demos/gtk-demo/flowbox.c b/demos/gtk-demo/flowbox.c
index fd87463b89..e1c707a6d1 100644
--- a/demos/gtk-demo/flowbox.c
+++ b/demos/gtk-demo/flowbox.c
@@ -739,7 +739,7 @@ do_flowbox (GtkWidget *do_widget)
       gtk_window_set_child (GTK_WINDOW (window), scrolled);
 
       for (i = 0; colors[i]; i++)
-        gtk_container_add (GTK_CONTAINER (flowbox), color_swatch_new (colors[i]));
+        gtk_flow_box_insert (GTK_FLOW_BOX (flowbox), color_swatch_new (colors[i]), -1);
     }
 
   if (!gtk_widget_get_visible (window))
diff --git a/tests/testflowbox.c b/tests/testflowbox.c
index 0b5386a214..39c39afc55 100644
--- a/tests/testflowbox.c
+++ b/tests/testflowbox.c
@@ -54,7 +54,7 @@ populate_flowbox_simple (GtkFlowBox *flowbox)
       gtk_frame_set_child (GTK_FRAME (frame), widget);
 
       g_object_set_data_full (G_OBJECT (frame), "id", (gpointer)g_strdup (text), g_free);
-      gtk_container_add (GTK_CONTAINER (flowbox), frame);
+      gtk_flow_box_insert (GTK_FLOW_BOX (flowbox), frame, -1);
 
       g_free (text);
     }
@@ -102,7 +102,7 @@ populate_flowbox_focus (GtkFlowBox *flowbox)
       if (i % 5 == 0)
         gtk_container_add (GTK_CONTAINER (box), gtk_switch_new ());
 
-      gtk_container_add (GTK_CONTAINER (flowbox), frame);
+      gtk_flow_box_insert (GTK_FLOW_BOX (flowbox), frame, -1);
       if (!sensitive)
         gtk_widget_set_sensitive (gtk_widget_get_parent (frame), FALSE);
     }
@@ -118,7 +118,7 @@ populate_flowbox_buttons (GtkFlowBox *flowbox)
     {
       widget = gtk_button_new_with_label ("Button");
       gtk_widget_show (widget);
-      gtk_container_add (GTK_CONTAINER (flowbox), widget);
+      gtk_flow_box_insert (GTK_FLOW_BOX (flowbox), widget, -1);
       widget = gtk_widget_get_parent (widget);
       gtk_widget_set_can_focus (widget, FALSE);
     }
@@ -153,7 +153,7 @@ populate_flowbox_wrappy (GtkFlowBox *flowbox)
       gtk_label_set_width_chars (GTK_LABEL (widget), 10);
       g_object_set_data_full (G_OBJECT (frame), "id", (gpointer)g_strdup (strings[i]), g_free);
 
-      gtk_container_add (GTK_CONTAINER (flowbox), frame);
+      gtk_flow_box_insert (GTK_FLOW_BOX (flowbox), frame, -1);
     }
 }
 
@@ -190,17 +190,10 @@ populate_flowbox_images (GtkFlowBox *flowbox)
 static void
 populate_items (GtkFlowBox *flowbox)
 {
-  GList *children, *l;
-
-  /* Remove all children first */
-  children = gtk_container_get_children (GTK_CONTAINER (flowbox));
-  for (l = children; l; l = l->next)
-    {
-      GtkWidget *child = l->data;
+  GtkWidget *child;
 
-      gtk_container_remove (GTK_CONTAINER (flowbox), child);
-    }
-  g_list_free (children);
+  while ((child = gtk_widget_get_first_child (GTK_WIDGET (flowbox))))
+    gtk_flow_box_remove (flowbox, child);
 
   if (items_type == SIMPLE_ITEMS)
     populate_flowbox_simple (flowbox);