CSharp: added waiting for request_referencing and test for cross-file references

src/solidlsp/language_servers/csharp_language_server.py

@@ -13,6 +13,7 @@ import threading
 import urllib.request
 import zipfile
 from pathlib import Path
+from time import sleep
 from typing import cast
 
 from overrides import override
@@ -21,6 +22,7 @@ from solidlsp.ls import SolidLanguageServer
 from solidlsp.ls_config import LanguageServerConfig
 from solidlsp.ls_exceptions import SolidLSPException
 from solidlsp.ls_logger import LanguageServerLogger
+from solidlsp.ls_types import Location
 from solidlsp.ls_utils import PathUtils
 from solidlsp.lsp_protocol_handler.lsp_types import InitializeParams
 from solidlsp.lsp_protocol_handler.server import ProcessLaunchInfo
@@ -735,3 +737,10 @@ class CSharpLanguageServer(SolidLanguageServer):
             project_uris = [PathUtils.path_to_uri(project_file) for project_file in project_files]
             self.server.notify.send_notification("project/open", {"projects": project_uris})
             self.logger.log(f"Opened project files: {project_files}", logging.DEBUG)
+
+    @override
+    def request_references(self, relative_file_path: str, line: int, column: int) -> list[Location]:
+        # Like in the typescript LS, we need to wait here for the language server to
+        # get correct results that include cross-file references.
+        sleep(1)
+        return super().request_references(relative_file_path, line, column)