Wrong error log in multiple tools

[MischaPanch]

In many tools, including FindSymbol we iterate over LS to retrieve the symbols. This relies on a wrong LS not retrieving anything, but a wrong LS will log an error.

The problematic code:

# in symbol.py
        for lang_server in self._ls_manager.iter_language_servers():
            symbol_roots = lang_server.request_full_symbol_tree(within_relative_path=within_relative_path)
            for root in symbol_roots:
                symbols.extend(
                    LanguageServerSymbol(root).find(
                        name_path_pattern, include_kinds=include_kinds, exclude_kinds=exclude_kinds, substring_matching=substring_matching
                    )
                )

and in solidlsp in request_full_symbol_tree

                if self.is_ignored_path(within_relative_path):
                    log.error("You passed a file explicitly, but it is ignored. This is probably an error. File: %s", within_relative_path)

[opcode81]

The PR #1099 fixes this.

[opcode81]

The PR fixes it by only applying the LS that is known to match the file.
But, actually, we are perhaps being overzealous when treating files as ignored.
It might be wrong to assume that all files which do not match the known file extensions must be ignored. We might want to reconsider this. It is potentially a problem in a few cases where code in a known language is within a file with an extension that is perhaps unusual.
... but only as long as it isn't a problem to ask an LS to look at a file it doesn't understand, of course (which hopefully is the case).