src/vs/base/browser/ui/scrollbar/horizontalScrollbar.ts/HorizontalScrollbar/updateOptions
class HorizontalScrollbar:	public updateOptions(options: ScrollableElementResolvedOptions): void {
		this.updateScrollbarSize(options.horizontal === ScrollbarVisibility.Hidden ? 0 : options.horizontalScrollbarSize);
		this._scrollbarState.setOppositeScrollbarSize(options.vertical === ScrollbarVisibility.Hidden ? 0 : options.verticalScrollbarSize);
		this._visibilityController.setVisibility(options.horizontal);
		this._scrollByPage = options.scrollByPage;
	}