Make rootPath undefined in a multiroot workspace, #69335

src/vs/workbench/api/common/extHostWorkspace.ts

@@ -339,6 +339,11 @@ export class ExtHostWorkspace implements ExtHostWorkspaceShape, IExtHostWorkspac
 		if (folders.length === 0) {
 			return undefined;
 		}
+
+		if (folders.length > 1) {
+			return undefined;
+		}
+
 		// #54483 @Joh Why are we still using fsPath?
 		return folders[0].uri.fsPath;
 	}

src/vs/workbench/test/electron-browser/api/extHostWorkspace.test.ts

@@ -120,7 +120,7 @@ suite('ExtHostWorkspace', function () {
 		assert.equal(ws.getPath(), undefined);
 
 		ws = createExtHostWorkspace(new TestRPCProtocol(), { id: 'foo', name: 'Test', folders: [aWorkspaceFolderData(URI.file('Folder'), 0), aWorkspaceFolderData(URI.file('Another/Folder'), 1)] }, new NullLogService());
-		assert.equal(ws.getPath()!.replace(/\\/g, '/'), '/Folder');
+		assert.equal(ws.getPath(), undefined);
 
 		ws = createExtHostWorkspace(new TestRPCProtocol(), { id: 'foo', name: 'Test', folders: [aWorkspaceFolderData(URI.file('/Folder'), 0)] }, new NullLogService());
 		assert.equal(ws.getPath()!.replace(/\\/g, '/'), '/Folder');