data tree view state should store scrollTop, #74410

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

@@ -18,6 +18,7 @@ export interface IDataTreeViewState {
 	readonly focus: string[];
 	readonly selection: string[];
 	readonly expanded: string[];
+	readonly scrollTop: number;
 }
 
 export class DataTree<TInput, T, TFilterData = void> extends AbstractTree<T | null, TFilterData, T | null> {
@@ -80,6 +81,10 @@ export class DataTree<TInput, T, TFilterData = void> extends AbstractTree<T | nu
 		this._refresh(input, isCollapsed, onDidCreateNode);
 		this.setFocus(focus);
 		this.setSelection(selection);
+
+		if (viewState && typeof viewState.scrollTop === 'number') {
+			this.scrollTop = viewState.scrollTop;
+		}
 	}
 
 	updateChildren(element: TInput | T = this.input!): void {
@@ -193,6 +198,6 @@ export class DataTree<TInput, T, TFilterData = void> extends AbstractTree<T | nu
 			queue.push(...node.children);
 		}
 
-		return { focus, selection, expanded };
+		return { focus, selection, expanded, scrollTop: this.scrollTop };
 	}
 }