bug#46119: 28.0.50; this-error-recenter

[Tino Calancha]

On Mon, 1 Feb 2021, Juri Linkov wrote:

> Actually everything is much simpler.  The hint is in the default value
> of 'xref-after-jump-hook' that contains 'recenter' by default.
> So when you customize 'xref-after-jump-hook' to the value:
>
>  (recenter-top-bottom xref-pulse-momentarily)
>
> you can use 'C-o' to recenter another window from xref buffer,
> exactly like 'C-l' does for the selected window.
>
> The same way you can add:
>
>  (add-hook 'next-error-hook 'recenter-top-bottom)
>
> then use 'C-o' in any next-error capable buffer (compilation, occur, ...)
> to recenter its corresponding window exactly like you want.

Thank you, that's nice. I still see superior adding a new command 
for 2 resons.

- I like to provide the binding by default to the users; same as we do 
with `n' or `p' to navigate the matches without selecting the buffer.  It 
is quite convenient.

- The hook above doesn't accept a prefix.  With the original proposal I 
can do:
2 l ; scroll the current displayed match at the second line.
This become handy when you want to inspect the context of the match.