Use `sign_getplaced` instead of `:sign place` when possible. about vim-signjump

[aktau]

Thinking about this, I think it's best to emulate vim-lsp check before using the new API:

if exists('*sign_define') && (has('nvim') || has('patch-8.1.0772'))
   " Both group=* and the new API are available.
endif

[ZeroKnight]

Wonderful, I was hoping they'd add to the signs API.

I would like to continue supporting versions without this new API, so I wonder what the best way would be to go about that. Using has v:version is what immediately comes to mind, but I wonder if there's a better way?

[aktau]

I think the best option is to check for the existence of this API:

if exists('*sign_define') ...

(See prabirshrestha/vim-lsp#322, which has a discussion on this topic.)