bug#5840: 24.0.50; wrong tramp-file-name-regexp

[Stefan Monnier]

>>> Where shall `completion-only' belong to? minibuffer.el?
>> Yes.
> I'll commit it later today.

Actually, now that I think about it, I think it's more general
than that.  It's basically the idea that the current execution is
non-essential (e.g. part of some background computation, or some
not-necessarily-expected part of a command like loading a desktop(.el)).

So maybe the variable should be in simple.el and named `non-essential'.


        Stefan