src/vs/workbench/browser/parts/editor/tabsTitleControl.ts/TabsTitleControl/getTabsScrollbarSizing
class TabsTitleControl:	private getTabsScrollbarSizing(): number {
		if (this.accessor.partOptions.titleScrollbarSizing !== 'large') {
			return TabsTitleControl.SCROLLBAR_SIZES.default;
		}

		return TabsTitleControl.SCROLLBAR_SIZES.large;
	}