[gtk/gtk-demo-fixes: 9/9] treeview: Fix embedding cell renderers

[Matthias Clasen <matthiasc src gnome org>]

commit 9e3147f78d6588d67e1b8d8beb502b74b69a9357
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Dec 24 03:39:02 2019 -0500

    treeview: Fix embedding cell renderers
    
    We need to manually set up the css node,
    since the treeview has children whose css
    node is not a direct child of the treeview
    css node (header buttons).

 gtk/gtktreeview.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index 76b24c08b4..291e7abc66 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -8195,6 +8195,9 @@ gtk_tree_view_put (GtkTreeView       *tree_view,
 
   tree_view->priv->children = g_list_append (tree_view->priv->children, child);
 
+  gtk_css_node_insert_after (gtk_widget_get_css_node (GTK_WIDGET (tree_view)),
+                             gtk_widget_get_css_node (child_widget),
+                             tree_view->priv->header_node);
   gtk_widget_set_parent (child_widget, GTK_WIDGET (tree_view));
 }