fix lsp restart (#10614)

helix-lsp/src/lib.rs

@@ -736,7 +736,15 @@ impl Registry {
             .language_servers
             .iter()
             .filter_map(|LanguageServerFeatures { name, .. }| {
-                if self.inner_by_name.contains_key(name) {
+                if let Some(old_clients) = self.inner_by_name.remove(name) {
+                    for old_client in old_clients {
+                        self.file_event_handler.remove_client(old_client.id());
+                        self.inner.remove(old_client.id());
+                        tokio::spawn(async move {
+                            let _ = old_client.force_shutdown().await;
+                        });
+                    }
+                }
                 let client = match self.start_client(
                     name.clone(),
                     language_config,
@@ -748,23 +756,10 @@ impl Registry {
                     Err(StartupError::NoRequiredRootFound) => return None,
                     Err(StartupError::Error(err)) => return Some(Err(err)),
                 };
-                    let old_clients = self
-                        .inner_by_name
-                        .insert(name.clone(), vec![client.clone()])
-                        .unwrap();
-
-                    for old_client in old_clients {
-                        self.file_event_handler.remove_client(old_client.id());
-                        self.inner.remove(client.id());
-                        tokio::spawn(async move {
-                            let _ = old_client.force_shutdown().await;
-                        });
-                    }
+                self.inner_by_name
+                    .insert(name.to_owned(), vec![client.clone()]);
 
                 Some(Ok(client))
-                } else {
-                    None
-                }
             })
             .collect()
     }