feat: default to single language server for multi-root workspaces

The R languageserver package now supports multi-root workspaces efficiently.
This change enables multi-root support when r.lsp.multiServer is disabled
and makes it the default.

Author: randy3k

package.json

@@ -1389,8 +1389,8 @@
         },
         "r.lsp.multiServer": {
           "type": "boolean",
-          "default": true,
-          "markdownDescription": "Use multiple language servers for [multi-root workspaces](https://code.visualstudio.com/docs/editor/multi-root-workspaces). If disabled, only one language server will be used to handle all requests from all workspaces and files."
+          "default": false,
+          "markdownDescription": "Use multiple language servers for [multi-root workspaces](https://code.visualstudio.com/docs/editor/multi-root-workspaces). If disabled, only one language server will be used to handle all requests from all workspaces and files. Disabling this is recommended if you have a recent version of the R `languageserver` package installed."
         },
         "r.rmarkdown.codeLensCommands": {
           "type": "array",

src/languageService.ts

@@ -318,7 +318,7 @@ export class LanguageService implements Disposable {
 
             const workspaceFolder = workspace.workspaceFolders?.[0];
             const cwd = workspaceFolder ? workspaceFolder.uri.fsPath : os.homedir();
-            self.client = await self.createClient(self.config, documentSelector, cwd, workspaceFolder, self.outputChannel);
+            self.client = await self.createClient(self.config, documentSelector, cwd, undefined, self.outputChannel);
         }
     }