bug#6527: C-h b autoloads iso-transl and alters key-translation-map

[Stefan Monnier]

IIRC the reason why we've accepted the "change upon load" behavior of
iso-transl.el for so long is that it only affects Alt bindings, and most
Emacs users probably don't have both Meta and Alt keys, so they can't
get to the Alt bindings anyway.

This said, I think your patch is doing the right thing: move those extra
bindings to a minor mode.

I'd just like to see the implementation changed to make use of the new
multiple inheritance in keymaps:
- define the added bindings statically in a separate keymap (call it
  iso-transl-mode-translation-map).
- when enabling/disabling the mode, just add/remove that map from the
  parents of key-translation-map.
That will save you from the iso-transl-define-key dance of saving
previous bindings.


        Stefan