src/vs/workbench/browser/parts/editor/tabsTitleControl.ts/TabsTitleControl/createTabsScrollbar
class TabsTitleControl:	private createTabsScrollbar(scrollable: HTMLElement): ScrollableElement {
		const tabsScrollbar = new ScrollableElement(scrollable, {
			horizontal: ScrollbarVisibility.Auto,
			horizontalScrollbarSize: this.getTabsScrollbarSizing(),
			vertical: ScrollbarVisibility.Hidden,
			scrollYToX: true,
			useShadows: false
		});

		tabsScrollbar.onScroll(e => {
			if (e.scrollLeftChanged) {
				scrollable.scrollLeft = e.scrollLeft;
			}
		});

		return tabsScrollbar;
	}