Fix initial terminal API state

src/vs/workbench/api/electron-browser/mainThreadTerminalService.ts

@@ -23,13 +23,19 @@ export class MainThreadTerminalService implements MainThreadTerminalServiceShape
 		this._proxy = extHostContext.getProxy(ExtHostContext.ExtHostTerminalService);
 		this._toDispose = [];
 		this._toDispose.push(terminalService.onInstanceCreated((terminalInstance) => {
-			// Delay this message so the TerminalInstance constructor has a change to finish and
+			// Delay this message so the TerminalInstance constructor has a chance to finish and
 			// return the ID normally to the extension host. The ID that is passed here will be used
 			// to register non-extension API terminals in the extension host.
 			setTimeout(() => this._onTerminalOpened(terminalInstance), 100);
 		}));
 		this._toDispose.push(terminalService.onInstanceDisposed((terminalInstance) => this._onTerminalDisposed(terminalInstance)));
 		this._toDispose.push(terminalService.onInstanceProcessIdReady((terminalInstance) => this._onTerminalProcessIdReady(terminalInstance)));
+
+		// Set initial ext host state
+		this.terminalService.terminalInstances.forEach(t => {
+			this._onTerminalOpened(t);
+			t.processReady.then(() => this._onTerminalProcessIdReady(t));
+		});
 	}
 
 	public dispose(): void {

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

@@ -235,6 +235,8 @@ export interface ITerminalInstance {
 
 	onProcessIdReady: Event<ITerminalInstance>;
 
+	processReady: TPromise<void>;
+
 	/**
 	 * The title of the terminal. This is either title or the process currently running or an
 	 * explicit name given to the terminal instance through the extension API.

src/vs/workbench/parts/terminal/electron-browser/terminalInstance.ts

@@ -107,7 +107,9 @@ export class TerminalInstance implements ITerminalInstance {
 
 	public disableLayout: boolean;
 	public get id(): number { return this._id; }
+	// TODO: Ideally processId would be merged into processReady
 	public get processId(): number { return this._processId; }
+	public get processReady(): TPromise<void> { return this._processReady; }
 	public get onDisposed(): Event<ITerminalInstance> { return this._onDisposed.event; }
 	public get onFocused(): Event<ITerminalInstance> { return this._onFocused.event; }
 	public get onProcessIdReady(): Event<ITerminalInstance> { return this._onProcessIdReady.event; }