Remove unsupported plugin menu visibility.

themes/Capitularia/functions-include.php

@@ -529,6 +529,31 @@ function on_do_parse_request ($do_parse, $wp, $extra_query_vars) // phpcs:ignore
     return $do_parse;
 }
 
+/**
+ * Removes the login menu if already logged in.
+ *
+ * This assumes the menu entry is a top-level one with an URL of: #cap_login_menu#
+ *
+ * @param array  $items An array of menu item post objects.
+ * @param object $menu  The menu object.
+ * @param array  $args  An array of arguments used to retrieve menu item objects.
+ *
+ * @return array The modified array of menu item post objects.
+ */
+function on_wp_get_nav_menu_items ($items, $menu, $args) {
+    foreach ($items as $key => $item) {
+        if (isset ($item->url)) {
+            if (strcmp ($item->url, MAGIC_LOGIN) === 0) {
+                if (is_user_logged_in()) {
+                    unset ($items[$key]);
+                }
+            }
+        }
+    }
+    return $items;
+}
+
+
 /**
  * Add dynamic url to login menu.  Remove text from twitter and fb logos.
  *

themes/Capitularia/functions.php

@@ -117,6 +117,7 @@ function () {
 /* add login url to menu */
 if (!is_admin ()) {
     add_filter ('nav_menu_link_attributes',        ns ('on_nav_menu_link_attributes'), 20, 4);
+    add_filter ('wp_get_nav_menu_items',           ns ('on_wp_get_nav_menu_items' ), 10, 3 );
 }
 
 /* allow SVG uploads */