[gtk/wip/otte/listview] list view: Be more careful with selection

[Matthias Clasen <matthiasc src gnome org>]

commit 9e2250e35d44b3e180dc6bf4a1b75b62d07277cc
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 5 14:38:20 2019 -0500

    list view: Be more careful with selection
    
    I've seen crashes in the font chooser with
    the selection-changed signal getting emitted
    early, and row being NULL.

 gtk/gtklistview.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtklistview.c b/gtk/gtklistview.c
index a07cdcf14a..c840e84fb7 100644
--- a/gtk/gtklistview.c
+++ b/gtk/gtklistview.c
@@ -1049,6 +1049,9 @@ gtk_list_view_model_selection_changed_cb (GListModel  *model,
 
   row = gtk_list_view_get_row (self, position, &offset);
 
+  if (row == NULL)
+    return;
+
   if (offset)
     {
       position += row->n_rows - offset;