src/vs/workbench/common/notifications.ts/NotificationViewItem/updateMessage
class NotificationViewItem:	updateMessage(input: NotificationMessage): void {
		const message = NotificationViewItem.parseNotificationMessage(input);
		if (!message || message.raw === this._message.raw) {
			return;
		}

		this._message = message;
		this._onDidChangeContent.fire({ kind: NotificationViewItemContentChangeKind.MESSAGE });
	}