[gtk/prop-list] columnview: Add a helper

[Matthias Clasen <matthiasc src gnome org>]

commit 8f9cc492b5be3003ea28ce8226e666c0b28dbead
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 18 12:51:15 2019 -0500

    columnview: Add a helper
    
    The column code needs to get access to the
    listitem widgets that are children of the listview,
    so add a getter.

 gtk/gtkcolumnview.c        | 6 ++++++
 gtk/gtkcolumnviewprivate.h | 2 ++
 2 files changed, 8 insertions(+)
---
diff --git a/gtk/gtkcolumnview.c b/gtk/gtkcolumnview.c
index 270a920abd..7557803049 100644
--- a/gtk/gtkcolumnview.c
+++ b/gtk/gtkcolumnview.c
@@ -805,6 +805,12 @@ gtk_column_view_get_header_widget (GtkColumnView *self)
   return GTK_LIST_ITEM_WIDGET (self->header);
 }
 
+GtkListView *
+gtk_column_view_get_list_view (GtkColumnView *self)
+{
+  return GTK_LIST_VIEW (self->listview);
+}
+
 /**
  * gtk_column_view_get_sorter:
  * @self: a #GtkColumnView
diff --git a/gtk/gtkcolumnviewprivate.h b/gtk/gtkcolumnviewprivate.h
index 0d5cbbeed6..8343c26144 100644
--- a/gtk/gtkcolumnviewprivate.h
+++ b/gtk/gtkcolumnviewprivate.h
@@ -21,11 +21,13 @@
 #define __GTK_COLUMN_VIEW_PRIVATE_H__
 
 #include "gtk/gtkcolumnview.h"
+#include "gtk/gtklistview.h"
 
 #include "gtk/gtkcolumnviewsorterprivate.h"
 #include "gtk/gtklistitemwidgetprivate.h"
 
 GtkListItemWidget *     gtk_column_view_get_header_widget       (GtkColumnView          *self);
+GtkListView *           gtk_column_view_get_list_view           (GtkColumnView          *self);
 
 void                    gtk_column_view_measure_across          (GtkColumnView          *self,
                                                                  int                    *minimum,