[gtk/matthiasc/for-master] filechooser: Prevent a crash

[Matthias Clasen <matthiasc src gnome org>]

commit 756c52ef08a3c4cc680f44caf93a6b3c2a44bb56
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Sep 12 10:40:13 2020 -0400

    filechooser: Prevent a crash
    
    With csd, we are handling external widgets when
    there is an entry in the headerbar. Use a weak ref
    to prevent that pointer from going stale. This fixes
    a crash when cancelling a save dialog.
    
    Fixes: #3110

 gtk/gtkfilechooserwidget.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/gtkfilechooserwidget.c b/gtk/gtkfilechooserwidget.c
index 12d7a14001..16375eab29 100644
--- a/gtk/gtkfilechooserwidget.c
+++ b/gtk/gtkfilechooserwidget.c
@@ -2322,6 +2322,7 @@ save_widgets_create (GtkFileChooserWidget *impl)
     {
       location_entry_disconnect (impl);
       impl->location_entry = impl->external_entry;
+      g_object_add_weak_pointer (impl->external_entry, (gpointer *)&impl->location_entry);
       location_entry_setup (impl);
 
       g_signal_connect_after (gtk_entry_get_key_controller (GTK_ENTRY (impl->external_entry)),