[gtk/matthiasc/for-master] popovermenu: Fix keynav with submenus

[Matthias Clasen <matthiasc src gnome org>]

commit 9543a5daebe43da14d5a8dd710d500940ebe97d3
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Dec 27 22:52:08 2019 -0500

    popovermenu: Fix keynav with submenus
    
    When we right-arrow all the way into a submenu
    and then cycle to the next menu in a menubar,
    we need to reset all open submenus, so that
    left-arrowing back to the menu puts the focus
    on the first item again.

 gtk/gtkpopovermenu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/gtk/gtkpopovermenu.c b/gtk/gtkpopovermenu.c
index 62993b51e3..447d21171a 100644
--- a/gtk/gtkpopovermenu.c
+++ b/gtk/gtkpopovermenu.c
@@ -360,6 +360,7 @@ gtk_popover_menu_focus (GtkWidget        *widget,
     {
       if (GTK_POPOVER_MENU (widget)->open_submenu)
         {
+  g_print ("open submenu\n");
           if (gtk_widget_child_focus (GTK_POPOVER_MENU (widget)->open_submenu, direction))
             return TRUE;
           if (direction == GTK_DIR_LEFT)
@@ -440,6 +441,14 @@ add_arrow_bindings (GtkBindingSet    *binding_set,
                                 GTK_TYPE_DIRECTION_TYPE, direction);
 }
 
+static void
+gtk_popover_menu_show (GtkWidget *widget)
+{
+  gtk_popover_menu_set_open_submenu (GTK_POPOVER_MENU (widget), NULL);
+
+  GTK_WIDGET_CLASS (gtk_popover_menu_parent_class)->show (widget);
+}
+
 static void
 gtk_popover_menu_class_init (GtkPopoverMenuClass *klass)
 {
@@ -454,6 +463,7 @@ gtk_popover_menu_class_init (GtkPopoverMenuClass *klass)
   widget_class->map = gtk_popover_menu_map;
   widget_class->unmap = gtk_popover_menu_unmap;
   widget_class->focus = gtk_popover_menu_focus;
+  widget_class->show = gtk_popover_menu_show;
 
   g_object_class_install_property (object_class,
                                    PROP_VISIBLE_SUBMENU,