Re: cc-mode fontification feels random

[Eli Zaretskii]

> From: Joost Kremers <joostkremers@fastmail.fm>
> Date: Fri, 04 Jun 2021 22:11:06 +0200
> 
> > I'm not an expert on the internals of LSP servers, but it's my
> > understanding that for a language server like clangd, it needs access
> > not just to the current file, but the entire source tree[1].
> 
> And speaking from my experience with lsp-mode (not eglot) and Python, it needs
> access to the entire virtual env so it can provide type information and
> completions for built-in Python packages and for 3rd-party packages that you 
> use
> your code.

That cannot be a mandatory requirement, right?  Because otherwise LSP
wouldn't be able to support editing of an unfinished project, where
not everything is laid out 100% yet.  The user will expect that some
completion cases could be inaccurate when not everything is coded yet,
but the user will NOT expect to see inaccurate "syntax highlighting"
or indentation, nor incorrect "show definition" and "show callers"
results for the code that was already written, and in particular for
the code in the file being edited.

Thus, I'd expect LSP to be able to deal with missing information,
which then means it shouldn't require access to the entire tree as a
prerequisite for useful functionality.

Am I missing something?