extension host: use UUID for delegatingCommandId instead of `Date.n…

…ow()` because when there are several extension hosts (created using "extensions.experimental.affinity") and they happen to be created at the same time, those IDs equal and command invocation may go to incorrect extension host

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

@@ -31,6 +31,7 @@ import { StopWatch } from 'vs/base/common/stopwatch';
 import { ExtensionIdentifier, IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 import { TelemetryTrustedValue } from 'vs/platform/telemetry/common/telemetryUtils';
 import { IExtHostTelemetry } from 'vs/workbench/api/common/extHostTelemetry';
+import { generateUuid } from 'vs/base/common/uuid';
 
 interface CommandHandler {
 	callback: Function;
@@ -342,7 +343,7 @@ export const IExtHostCommands = createDecorator<IExtHostCommands>('IExtHostComma
 
 export class CommandsConverter implements extHostTypeConverter.Command.ICommandsConverter {
 
-	readonly delegatingCommandId: string = `__vsc${Date.now().toString(36)} `;
+	readonly delegatingCommandId: string = `__vsc${generateUuid()}`;
 	private readonly _cache = new Map<string, vscode.Command>();
 	private _cachIdPool = 0;