lsp-completion: support completion-lazy-hilit and quicker company-match

[kiennq]

Currently lsp-mode doesn't highlight the candidates in the way corfu supports.
This PR adds:

• support for completion-lazy-hilit that can be used by corfu and alike completion UI. See Defer highlighting for completion styles minad/corfu#441
• Also, in lsp-completion--company-match we can use match-data when possible, instead of going through matching again.
• Finally, in the work-around for lsp-completion--company-match sometimes freeze my Emacs instance #4192, we can just use line-beginning-position as a guard for cached start point. That would be better than having a take whole long substring and then dissect it for the first line.

[sebastiencs]

Finally, in the work-around for #4192, we can just use line-beginning-position as a guard for cached start point. That would be better than having a take whole long substring and then dissect it for the first line.

That seems good

support for completion-lazy-hilit

Cool, I didn't know that completion-lazy-hilit

[kiennq]

@yyoncho Do you think you can merge this change?

[jcs090218]

I've tried this patch, but the completion is no longer working. 🤔

[kiennq]

I've tried this patch, but the completion is no longer working. 🤔

The completion via company-mode?

[jcs090218]

The completion via company-mode?

Yes.

[kiennq]

I've tried with emacs -Q and it seems still working fine.
The company configuration looks like this

(setenv "LSP_USE_PLISTS" "1")
(setq company-idle-delay 0.05
      company-minimum-prefix-length 2
      company-selection-wrap-around t
      company-require-match 'company-explicit-action-p
      company-backends `(company-capf))

[jcs090218]

I've tried with emacs -Q and it seems still working fine.
The company configuration looks like this

Hmm... It's working this time. I'm not sure why it didn't work the first time I tested it. Sorry for the noise.