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