[gtk+/gtk-3-22] modelbutton: set_relative_to(NULL) the popover in dispose

[Daniel Boles <dboles src gnome org>]

commit 13c63106889b847be8068137d00c2d7e2d6cfca5
Author: Timm Bäder <mail baedert org>
Date:   Fri Oct 6 17:35:28 2017 +0200

    modelbutton: set_relative_to(NULL) the popover in dispose
    
    We do set_relative_to(menu_button) when creating it so we should do this
    here (or nothing).

 gtk/gtkmenubutton.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkmenubutton.c b/gtk/gtkmenubutton.c
index 9a2115e..2b04b6d 100644
--- a/gtk/gtkmenubutton.c
+++ b/gtk/gtkmenubutton.c
@@ -1039,7 +1039,7 @@ gtk_menu_button_dispose (GObject *object)
 
   if (priv->popover)
     {
-      gtk_widget_destroy (priv->popover);
+      gtk_popover_set_relative_to (GTK_POPOVER (priv->popover), NULL);
       priv->popover = NULL;
     }