Re: on helm substantial differences

[Juri Linkov]

>> It would be nice if in addition to already existing 'annotation-function'
>> 'completing-read' also supported 'format-function' or 'display-function',
>> i.e. a function that would return a completion candidate to display
>> in the *Completions* buffer.
>
> Agreed: the `annotation-function` is much too limited.
> I don't think "in addition" is right tho: the new functionality should
> aim to replace the current `annotation-function`.

Then maybe to differentiate one from another: when the string
returned from `annotation-function` has text properties then
use it to display a complete candidate, otherwise append it
as an annotation - for backward compatibility.