[gtk/wip/corey/nested-popover-menu] modelbutton: Close popover menu submenus consistently

[Corey Berla <coreyberla src gnome org>]

commit 99fed1d15cee365139e6a834f24130fbf8412dd2
Author: Corey Berla <corey berla me>
Date:   Sat Sep 3 13:40:38 2022 -0700

    modelbutton: Close popover menu submenus consistently
    
    In a nested popover menu, the popover submenus are only closed
    when pointing to another item that also has a submenu.  If the pointer
    is hovering over an item without a submenu close any opened
    submenus.

 gtk/gtkmodelbutton.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/gtkmodelbutton.c b/gtk/gtkmodelbutton.c
index 624f94a305..a52223752b 100644
--- a/gtk/gtkmodelbutton.c
+++ b/gtk/gtkmodelbutton.c
@@ -1324,6 +1324,8 @@ open_submenu (gpointer data)
           gtk_popover_menu_set_open_submenu (GTK_POPOVER_MENU (popover), submenu);
           gtk_popover_menu_set_parent_menu (GTK_POPOVER_MENU (submenu), GTK_WIDGET (popover));
         }
+      else
+        gtk_popover_menu_close_submenus (GTK_POPOVER_MENU (popover));
     }
 
   button->open_timeout = 0;