Re: [PATCH] (icomplete-vertical-mode): Add support for affixations and, annotations

[Dmitry Gutov]

On 24.05.2021 13:26, Daniel Mendler wrote:
> This is more of a technical detail, but I also want to
> stress the point made by Juri in the other mail, that the backend may
> have to setup some "context" to compute the annotation data lazily. If
> this setup can only be done once per redisplay of the currently visible
> candidates, that is beneficial.

IME when annotations are computed only for a limited subset of 
completions (as is the case now), it doesn't matter too much if they 
have to be computed twice, 'cause the time it takes is still negligible.

But of course a frontend can set up a context itself (some hash-table 
inside its internals) which tracks which completions have which 
annotations, so it doesn't have to ask twice.