bug#66948: [PATCH] Add Completion Preview mode

[Juri Linkov]

>> and that there is no option to cycle between inexact completions.
>
> That's interesting, can you elaborate about the use case that you have
> in mind?  I thought about adding a command to do that, but I wasn't sure
> there'd be a good use case for it since you can always dismiss the
> preview (e.g. with `C-g`) and say `C-M-i` to pick another candidate.

Is it possible to avoid typing `C-g` before typing `C-M-i` for the list
of completions?  I mean that I'd prefer only TAB or RET to accept the
completion suggestion, but not `C-M-i`.  Then when the proposed preview
is correct, TAB or RET will accept it, otherwise `C-M-i` will immediately
display a list of alternative completions.