Use built-in CurSearch highlight group when available

[damnskippy]

Just a quick note about the relatively new highlight group:
https://vimhelp.org/syntax.txt.html#hl-CurSearch

Seems this is one of the loupe functionalities that is now natively built in. Not sure if it helps cut down anything as a result (maybe not in order to support older vim versions), or if it optimizes or speeds up anything in newer vim versions.
I continue using loupe#hlmatch() as a long time user and beneficiary of loupe, but thought I'd pop a note here in case.
Thank you.

[wincent]

Thanks for the pointer, @damnskippy!

This looks relatively recent (vim/vim@a439938) so it's not in the version of macOS that I currently use (Monterey 12.4):

VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Apr 19 2022 21:41:43)
macOS version - x86_64
Included patches: 1-4113
Compiled by [email protected]

Nor in the version that I compiled a while back with Homebrew:

VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Feb 16 2022 17:51:47)
macOS version - x86_64
Included patches: 1-4400
Compiled by Homebrew

Nor in my build of Neovim, which I should probably update 😬...

NVIM v0.7.0
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by brew@Monterey

After updating, I see the Neovim version of the change (neovim/neovim#18081) is not in a released build yet, so I guess we'll get it in v0.8.0:

NVIM v0.7.2
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by brew@Monterey

So it might be a while before this is extensively available, but you're right: Loupe will probably maintain the old code path for a while so that people on older builds can still benefit, but it does make sense to leverage the new functionality whenever it is available.