Fix #83715. Handle touch to scroll in interactive playground.

src/vs/workbench/contrib/welcome/walkThrough/browser/walkThroughPart.ts

@@ -5,6 +5,7 @@
 
 import 'vs/css!./walkThroughPart';
 import { DomScrollableElement } from 'vs/base/browser/ui/scrollbar/scrollableElement';
+import { EventType as TouchEventType, GestureEvent, Gesture } from 'vs/base/browser/touch';
 import { ScrollbarVisibility } from 'vs/base/common/scrollable';
 import * as strings from 'vs/base/common/strings';
 import { URI } from 'vs/base/common/uri';
@@ -37,6 +38,7 @@ import { INotificationService } from 'vs/platform/notification/common/notificati
 import { Dimension, size } from 'vs/base/browser/dom';
 import { IEditorGroupsService } from 'vs/workbench/services/editor/common/editorGroupsService';
 import { CancellationToken } from 'vs/base/common/cancellation';
+import { domEvent } from 'vs/base/browser/event';
 
 export const WALK_THROUGH_FOCUS = new RawContextKey<boolean>('interactivePlaygroundFocus', false);
 
@@ -112,6 +114,14 @@ export class WalkThroughPart extends BaseEditor {
 		}
 	}
 
+	private onTouchChange(event: GestureEvent) {
+		event.preventDefault();
+		event.stopPropagation();
+
+		const scrollPosition = this.scrollbar.getScrollPosition();
+		this.scrollbar.setScrollPosition({ scrollTop: scrollPosition.scrollTop - event.translationY });
+	}
+
 	private addEventListener<K extends keyof HTMLElementEventMap, E extends HTMLElement>(element: E, type: K, listener: (this: E, ev: HTMLElementEventMap[K]) => any, useCapture?: boolean): IDisposable;
 	private addEventListener<E extends HTMLElement>(element: E, type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): IDisposable;
 	private addEventListener<E extends HTMLElement>(element: E, type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): IDisposable {
@@ -396,6 +406,8 @@ export class WalkThroughPart extends BaseEditor {
 				this.scrollbar.scanDomNode();
 				this.loadTextEditorViewState(input);
 				this.updatedScrollPosition();
+				this.contentDisposables.push(Gesture.addTarget(innerContent));
+				this.contentDisposables.push(domEvent(innerContent, TouchEventType.Change)(this.onTouchChange, this, this.disposables));
 			});
 	}