CSharpLanguageServer: Wait for indexing to complete

resolving issues pertaining to retrievals not working correctly initially

Fixes #814

src/solidlsp/language_servers/csharp_language_server.py

@@ -627,10 +627,14 @@ class CSharpLanguageServer(SolidLanguageServer):
         def handle_project_needs_restore(params: dict) -> None:
             return
 
+        def handle_workspace_indexing_complete(params: dict) -> None:
+            self.completions_available.set()
+
         # Set up notification handlers
         self.server.on_notification("window/logMessage", window_log_message)
         self.server.on_notification("$/progress", handle_progress)
         self.server.on_notification("textDocument/publishDiagnostics", do_nothing)
+        self.server.on_notification("workspace/projectInitializationComplete", handle_workspace_indexing_complete)
         self.server.on_request("workspace/configuration", handle_workspace_configuration)
         self.server.on_request("window/workDoneProgress/create", handle_work_done_progress_create)
         self.server.on_request("client/registerCapability", handle_register_capability)
@@ -679,7 +683,6 @@ class CSharpLanguageServer(SolidLanguageServer):
         self._open_solution_and_projects()
 
         self.initialization_complete.set()
-        self.completions_available.set()
 
         log.info(
             "Microsoft.CodeAnalysis.LanguageServer initialized and ready\n"
@@ -687,6 +690,12 @@ class CSharpLanguageServer(SolidLanguageServer):
             "This may take a while for large projects"
         )
 
+        if self.completions_available.wait(30):  # Wait up to 30 seconds for indexing
+            log.info("Indexing complete")
+        else:
+            log.warning("Timeout waiting for indexing to complete, proceeding anyway")
+            self.completions_available.set()
+
     def _force_pull_diagnostics(self, init_response: dict | InitializeResult) -> None:
         """
         Apply the diagnostic capabilities hack.