src/vs/base/browser/ui/list/listWidget.ts/KeyboardController/onPageDownArrow
class KeyboardController:	private onPageDownArrow(e: StandardKeyboardEvent): void {
		e.preventDefault();
		e.stopPropagation();
		this.list.focusNextPage(e.browserEvent);
		this.list.reveal(this.list.getFocus()[0]);
		this.view.domNode.focus();
	}