fixes #64749

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

@@ -431,6 +431,16 @@ export class ListView<T> implements ISpliceable<T>, IDisposable {
 		return scrollDimensions.height;
 	}
 
+	get firstVisibleIndex(): number {
+		const range = this.getRenderRange(this.lastRenderTop, this.lastRenderHeight);
+		return range.start;
+	}
+
+	get lastVisibleIndex(): number {
+		const range = this.getRenderRange(this.lastRenderTop, this.lastRenderHeight);
+		return range.end - 1;
+	}
+
 	element(index: number): T {
 		return this.items[index].element;
 	}

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

@@ -1308,6 +1308,14 @@ export class List<T> implements ISpliceable<T>, IDisposable {
 		return this.view.renderHeight;
 	}
 
+	get firstVisibleIndex(): number {
+		return this.view.firstVisibleIndex;
+	}
+
+	get lastVisibleIndex(): number {
+		return this.view.lastVisibleIndex;
+	}
+
 	domFocus(): void {
 		this.view.domNode.focus();
 	}

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

@@ -1090,6 +1090,18 @@ export abstract class AbstractTree<T, TFilterData, TRef> implements IDisposable
 		return this.view.renderHeight;
 	}
 
+	get firstVisibleElement(): T {
+		const index = this.view.firstVisibleIndex;
+		const node = this.view.element(index);
+		return node.element;
+	}
+
+	get lastVisibleElement(): T {
+		const index = this.view.lastVisibleIndex;
+		const node = this.view.element(index);
+		return node.element;
+	}
+
 	domFocus(): void {
 		this.view.domFocus();
 	}

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

@@ -372,6 +372,14 @@ export class AsyncDataTree<TInput, T, TFilterData = void> implements IDisposable
 		return this.tree.renderHeight;
 	}
 
+	get firstVisibleElement(): T {
+		return this.tree.firstVisibleElement!.element as T;
+	}
+
+	get lastVisibleElement(): T {
+		return this.tree.lastVisibleElement!.element as T;
+	}
+
 	domFocus(): void {
 		this.tree.domFocus();
 	}