Support detach from process in remote

Part of #118276

src/vs/workbench/contrib/terminal/browser/remotePty.ts

@@ -68,6 +68,11 @@ export class RemotePty extends Disposable implements ITerminalChildProcess {
 		return undefined;
 	}
 
+	async detach(): Promise<void> {
+		await this._startBarrier.wait();
+		return this._remoteTerminalChannel.detachFromProcess(this.id);
+	}
+
 	shutdown(immediate: boolean): void {
 		this._startBarrier.wait().then(_ => {
 			this._remoteTerminalChannel.shutdown(this._id, immediate);

src/vs/workbench/contrib/terminal/browser/terminal.ts

@@ -490,7 +490,7 @@ export interface ITerminalInstance {
 	/**
 	 * Inform the process that the terminal is now detached.
 	 */
-	detachFromProcess(): void;
+	detachFromProcess(): Promise<void>;
 
 	/**
 	 * Forces the terminal to redraw its viewport.

src/vs/workbench/contrib/terminal/browser/terminalActions.ts

@@ -904,7 +904,8 @@ export function registerTerminalActions() {
 			});
 		}
 		async run(accessor: ServicesAccessor) {
-			accessor.get(ITerminalService).doWithActiveInstance(instance => instance.detachFromProcess());
+			const terminalService = accessor.get(ITerminalService);
+			await terminalService.getActiveInstance()?.detachFromProcess();
 		}
 	});
 	registerAction2(class extends Action2 {

src/vs/workbench/contrib/terminal/browser/terminalInstance.ts

@@ -984,8 +984,8 @@ export class TerminalInstance extends Disposable implements ITerminalInstance {
 		super.dispose();
 	}
 
-	detachFromProcess(): void {
-		this._processManager.detachFromProcess();
+	async detachFromProcess(): Promise<void> {
+		await this._processManager.detachFromProcess();
 		this.dispose();
 	}
 

src/vs/workbench/contrib/terminal/browser/terminalProcessManager.ts

@@ -174,8 +174,15 @@ export class TerminalProcessManager extends Disposable implements ITerminalProce
 		});
 	}
 
-	detachFromProcess(): void {
-		this._process?.detach?.();
+	async detachFromProcess(): Promise<void> {
+		if (!this._process) {
+			return;
+		}
+		if (this._process.detach) {
+			await this._process.detach();
+		} else {
+			throw new Error('This terminal process does not support detaching');
+		}
 		this._process = null;
 	}
 

src/vs/workbench/contrib/terminal/common/remoteTerminalChannel.ts

@@ -198,6 +198,9 @@ export class RemoteTerminalChannelClient {
 	attachToProcess(id: number): Promise<void> {
 		return this._channel.call('$attachToProcess', [id]);
 	}
+	detachFromProcess(id: number): Promise<void> {
+		return this._channel.call('$detachFromProcess', [id]);
+	}
 	listProcesses(): Promise<IProcessDetails[]> {
 		return this._channel.call('$listProcesses');
 	}

src/vs/workbench/contrib/terminal/common/terminal.ts

@@ -297,7 +297,7 @@ export interface ITerminalProcessManager extends IDisposable {
 	readonly onEnvironmentVariableInfoChanged: Event<IEnvironmentVariableInfo>;
 
 	dispose(immediate?: boolean): void;
-	detachFromProcess(): void;
+	detachFromProcess(): Promise<void>;
 	createProcess(shellLaunchConfig: IShellLaunchConfig, cols: number, rows: number, isScreenReaderModeEnabled: boolean): Promise<ITerminalLaunchError | undefined>;
 	relaunch(shellLaunchConfig: IShellLaunchConfig, cols: number, rows: number, isScreenReaderModeEnabled: boolean, reset: boolean): Promise<ITerminalLaunchError | undefined>;
 	write(data: string): void;