msb.el is broken

[Juri Linkov]

I noticed that msb.el is now broken: it doesn't accept down events
anymore, like the normal buffer selection menu does.  This is caused
by the recent change.

And there is also another bug in msb.el: after selecting a sub-menu
it fails with:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  x-popup-menu(((346 172) #<window 3 on *scratch*>) ("Most recently used (1)" 
("*Messages*" "*  *Messages*" (nil) . menu-bar-select-buffer)))
  mouse-select-buffer((C-down-mouse-1 (#<window 3 on *scratch*> 1 (346 . 172) 
12486921 nil 1 (57 . 0) nil (346 . 172) (6 . 10))))
  mouse-select-buffer((C-down-mouse-1 (#<window 3 on *scratch*> 1 (346 . 172) 
12486921 nil 1 (57 . 0) nil (346 . 172) (6 . 10))))
  msb((C-down-mouse-1 (#<window 3 on *scratch*> 1 (346 . 172) 12486921 nil 1 
(57 . 0) nil (346 . 172) (6 . 10))))
  call-interactively(msb)

Perhaps this depends on the toolkit used.  I use no toolkit on GNU/Linux.

As I see this bug is possibly caused by some changes in the menu
specifications: it fails with nil element in the certain position of the
menu specification.  In Emacs 21.4 there is nil in the same position, but
it doesn't fail.

-- 
Juri Linkov
http://www.jurta.org/emacs/