Re: Emacs hangs enabling debug-on-error

[Kim F. Storm]

Richard Stallman <address@hidden> writes:

>     The problem is that redisplay triggers an error which throws to
>     top-level while input is blocked, and we don't unblock input in that
>     case.
> 
> What exactly is the case where processing an error does not unblock
> input?
> 

in xdisp.c :

          /* Build desired tool-bar items from keymaps.  */
          BLOCK_INPUT;
          f->tool_bar_items
            = tool_bar_items (f->tool_bar_items, &f->n_tool_bar_items);
          UNBLOCK_INPUT;


The following code demonstrates the error:

(setq debug-on-error t)

(define-key tool-bar-map [tt-exit]
  '(menu-item
    "TEST"
    vm-toolbar-next-command
    :enable (vm-toolbar-any-messages-p)
    :button (:toggle nil)
    :image (image :type xpm :mask heuristic :file "../lisp/toolbar/alias.xpm")))

-- 
Kim F. Storm  http://www.cua.dk