bug#8781: bug#8730: bug#8781: bug#8730: bug#8781: 24.0.50; unload-feature don't restore default key

[Stefan Monnier]

>>> Or are you proposing to go through the buffer list and checking
>>> whether their major modes are defined in the package being unloaded?
>> Ah, yes, indeed, that's another solution that would work as well.
> I prefer that, because it is more thorough.  There's no point in a
> buffer keeping a major mode that is going to be undefined.

Agreed.

> But anyway, this is a new feature, sort of.

Yes, it's clearly not for emacs-23.


        Stefan