bug#1512: 23.0.60; SPC, TAB during completion do not do word completion, prefix completion

[Stefan Monnier]

>> > Prior to Emacs 23, both regular prefix completion and word 
>> > completion were available by default: TAB for the former,
>> > SPC for the latter.
>> 
>> Define "word completion", please,

> What SPC does in Emacs ..., 20, 21, 22: `minibuffer-complete-word'.

>> From Emacs manual, node Completion Commands:

> `<SPC>'
> Complete up to one word from the minibuffer text before point
> (`minibuffer-complete-word').

That's sufficiently vague that I don't see in what way the current
behavior of SPC doesn't obey it.


        Stefan