Enable status bar for notebooks (#14817)

* enable status bar for notebooks

* add onCellExecutionStart event to notebook service

* fix test, change var name

src/sql/workbench/services/notebook/browser/models/cell.ts

@@ -531,6 +531,7 @@ export class CellModel extends Disposable implements ICellModel {
 						}, false);
 						this.setFuture(future as FutureInternal);
 						this.fireExecutionStateChanged();
+						this._notebookService?.notifyCellExecutionStarted();
 						// For now, await future completion. Later we should just track and handle cancellation based on model notifications
 						let result: nb.IExecuteReplyMsg = <nb.IExecuteReplyMsg><any>await future.done;
 						if (result && result.content) {
@@ -551,6 +552,7 @@ export class CellModel extends Disposable implements ICellModel {
 								let commandExecuted = this._commandService?.executeCommand(result.commandId, result.args);
 								// This will ensure that the run button turns into a stop button
 								this.fireExecutionStateChanged();
+								this._notebookService?.notifyCellExecutionStarted();
 								await commandExecuted;
 								// For save files, if we output a message after saving the file, the file becomes dirty again.
 								// Special casing this to avoid this particular issue.

src/sql/workbench/services/notebook/browser/notebookService.ts

@@ -129,6 +129,16 @@ export interface INotebookService {
 	 * @param isTrusted True if notebook is to be set to trusted, false otherwise.
 	 */
 	setTrusted(notebookUri: URI, isTrusted: boolean): Promise<boolean>;
+
+	/**
+	 * Event that gets fired when a cell is executed.
+	 */
+	onCodeCellExecutionStart: Event<void>;
+
+	/**
+	 * Fires the onCodeCellExecutionStart event.
+	 */
+	notifyCellExecutionStarted(): void;
 }
 
 export interface INotebookProvider {

src/sql/workbench/services/notebook/browser/notebookServiceImpl.ts

@@ -108,6 +108,7 @@ export class NotebookService extends Disposable implements INotebookService {
 	private _isRegistrationComplete = false;
 	private _trustedCacheQueue: URI[] = [];
 	private _unTrustedCacheQueue: URI[] = [];
+	private _onCodeCellExecutionStart: Emitter<void> = new Emitter<void>();
 
 	constructor(
 		@ILifecycleService lifecycleService: ILifecycleService,
@@ -639,4 +640,12 @@ export class NotebookService extends Disposable implements INotebookService {
 
 		return isTrusted;
 	}
+
+	get onCodeCellExecutionStart(): Event<void> {
+		return this._onCodeCellExecutionStart.event;
+	}
+
+	notifyCellExecutionStarted(): void {
+		this._onCodeCellExecutionStart.fire();
+	}
 }