list expose scrollLeft

src/vs/base/browser/ui/list/listView.ts

@@ -683,6 +683,22 @@ export class ListView<T> implements ISpliceable<T>, IDisposable {
 		this.scrollableElement.setScrollPosition({ scrollTop });
 	}
 
+	getScrollLeft(): number {
+		const scrollPosition = this.scrollableElement.getScrollPosition();
+		return scrollPosition.scrollLeft;
+	}
+
+	setScrollLeftt(scrollLeft: number): void {
+		if (this.scrollableElementUpdateDisposable) {
+			this.scrollableElementUpdateDisposable.dispose();
+			this.scrollableElementUpdateDisposable = null;
+			this.scrollableElement.setScrollDimensions({ scrollWidth: this.scrollWidth });
+		}
+
+		this.scrollableElement.setScrollPosition({ scrollLeft });
+	}
+
+
 	get scrollTop(): number {
 		return this.getScrollTop();
 	}

src/vs/base/browser/ui/list/listWidget.ts

@@ -1307,6 +1307,14 @@ export class List<T> implements ISpliceable<T>, IDisposable {
 		this.view.setScrollTop(scrollTop);
 	}
 
+	get scrollLeft(): number {
+		return this.view.getScrollLeft();
+	}
+
+	set scrollLeft(scrollLeft: number) {
+		this.view.setScrollLeftt(scrollLeft);
+	}
+
 	get scrollHeight(): number {
 		return this.view.scrollHeight;
 	}

src/vs/base/browser/ui/tree/abstractTree.ts

@@ -1319,6 +1319,14 @@ export abstract class AbstractTree<T, TFilterData, TRef> implements IDisposable
 		this.view.scrollTop = scrollTop;
 	}
 
+	get scrollLeft(): number {
+		return this.view.scrollTop;
+	}
+
+	set scrollLeft(scrollLeft: number) {
+		this.view.scrollLeft = scrollLeft;
+	}
+
 	get scrollHeight(): number {
 		return this.view.scrollHeight;
 	}

src/vs/base/browser/ui/tree/asyncDataTree.ts

@@ -400,6 +400,14 @@ export class AsyncDataTree<TInput, T, TFilterData = void> implements IDisposable
 		this.tree.scrollTop = scrollTop;
 	}
 
+	get scrollLeft(): number {
+		return this.tree.scrollLeft;
+	}
+
+	set scrollLeft(scrollLeft: number) {
+		this.tree.scrollLeft = scrollLeft;
+	}
+
 	get scrollHeight(): number {
 		return this.tree.scrollHeight;
 	}