This PR updates how we determine the "primary" language server for a
buffer to make it respect the order specified by the `language_servers`
setting.
Previously we were relying on the language servers to be registered in
the right order in order to select the primary one effectively.
However, in my testing I observed some cases where a native language
server (e.g., `tailwindcss-language-server`) could end up first in the
list of language servers despite not being first in the
`language_servers` setting.
While this wasn't a problem for the Tailwind or ESLint language servers
on account of them being defined natively with the designation of
"secondary" language servers, this could cause problems with
extension-based language servers.
To remedy this, every time we start up language servers we reorder the
list of language servers for a given language to reflect the order in
the `language_servers` setting. This ordering then allows us to treat
the first language server in the list as the "primary" one.
Related issues:
- https://github.com/zed-industries/zed/issues/15023
- https://github.com/zed-industries/zed/issues/15279
Release Notes:
- The ordering of language servers will now respect the order in the
`language_servers` setting.
- The first language server in this list will be used as the primary
language server.
3bd9a3f478