Fix language server cache directory

A language server's cache directory was determined by the language_id rather than
the language server identifier's key. The two identifiers coincided in most cases.

CHANGELOG.md

@@ -73,6 +73,8 @@ Status of the `main` branch. Changes prior to the next official version change w
     specific, measured overshoot when building its high-level document symbols (#1974)
   - Fix: High-level document symbol cache was not invalidated when the LS-specific low-level result 
     version changed
+  - Fix: A language server's cache directory was determined by the language_id rather than 
+    the language server identifier's key. The two identifiers coincided in most cases.
   - Fix: TypeScript and VTS now disable automatic type acquisition as intended, while VTS
     preserves explicit user settings across initialization and configuration requests (#1989)
     VTS initialization options now override defaults per top-level key rather than replacing the

src/solidlsp/ls.py

@@ -546,7 +546,7 @@ class SolidLanguageServer(ABC):
         self._published_diagnostics_condition = threading.Condition()
 
         # initialise symbol caches
-        self.cache_dir = Path(self._solidlsp_settings.project_data_path) / self.CACHE_FOLDER_NAME / self.language_id
+        self.cache_dir = Path(self._solidlsp_settings.project_data_path) / self.CACHE_FOLDER_NAME / self.ls_id.get_key()
         self.cache_dir.mkdir(parents=True, exist_ok=True)
         # * raw document symbols cache
         self._ls_specific_raw_document_symbols_cache_version = cache_version_raw_document_symbols