bug#50067: Context menus

[Juri Linkov]

> Currently the option context-menu-global of context-menu-functions
> doesn't take into account the variable menu-bar-final-items
> to properly order the menu items.  This patch makes it possible
> to order the items of global-map instead of menu-bar-current-active-maps
> used in menu-bar-keymap by default:

Actually, here is a better patch that will also allow sorting items on
context-menu-local as well.  The same KEYMAP arg of menu-bar-keymap
could be used also in mouse-menu-bar-map to sort items of [C-down-mouse-3]
in the right order (they were unsorted for a long time):

diff --git a/lisp/menu-bar.el b/lisp/menu-bar.el
index 1a81f1a3d0..94e75efeeb 100644
--- a/lisp/menu-bar.el
+++ b/lisp/menu-bar.el
@@ -2738,7 +2738,7 @@ menu-bar-keymap
              ;; sorting.
              (push (cons pos menu-item) menu-end)
            (push menu-item menu-bar))))
-     (lookup-key (or keymap (menu-bar-current-active-maps)) [menu-bar]))
+     (or keymap (lookup-key (menu-bar-current-active-maps) [menu-bar])))
     `(keymap ,@(nreverse menu-bar)
              ,@(mapcar #'cdr (sort menu-end
                                    (lambda (a b)
diff --git a/lisp/mouse.el b/lisp/mouse.el
index d6912892ef..5b9ae121d7 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -271,10 +271,10 @@ mouse-menu-bar-map
     ;; FIXME: We have a problem here: we have to use the global/local/minor
     ;; so they're displayed in the expected order, but later on in the command
     ;; loop, they're actually looked up in the opposite order.
-    (apply 'append
-           global-menu
-           local-menu
-           minor-mode-menus)))
+    (menu-bar-keymap (apply 'append
+                            global-menu
+                            local-menu
+                            minor-mode-menus))))
 
 
 ;; Context menus.
@@ -364,7 +364,7 @@ context-menu-global
                 (when (consp binding)
                   (define-key-after menu (vector key)
                     (copy-sequence binding))))
-              (menu-bar-keymap global-map))
+              (menu-bar-keymap (lookup-key global-map [menu-bar])))
   menu)
 
 (defun context-menu-local (menu _click)
@@ -377,7 +377,7 @@ context-menu-local
                     (when (consp binding)
                       (define-key-after menu (vector key)
                         (copy-sequence binding))))
-                  keymap)))
+                  (menu-bar-keymap keymap))))
   menu)
 
 (defun context-menu-minor (menu _click)