GtkPopover: avoid a critical

focus_widget can be NULL, as pointed out in
https://bugzilla.gnome.org/show_bug.cgi?id=723181#c7

diff --git a/gtk/gtkpopover.c b/gtk/gtkpopover.c
index b9dd81123e441c318d48284f358cc7dfbc42b4cf..378fb2cee566d667e4e725966df3f02c8121731d 100644 (file)
--- a/gtk/gtkpopover.c
+++ b/gtk/gtkpopover.c
@@ -246,7 +246,9 @@ gtk_popover_apply_modality (GtkPopover *popover,
       GtkWidget *prev_focus;
 
       prev_focus = gtk_window_get_focus (priv->window);
-      priv->prev_focus_widget = g_object_ref (prev_focus);
+      priv->prev_focus_widget = prev_focus;
+      if (priv->prev_focus_widget)
+        g_object_ref (prev_focus);
       gtk_grab_add (GTK_WIDGET (popover));
       gtk_widget_grab_focus (GTK_WIDGET (popover));
     }