src/vs/workbench/browser/parts/editor/tabsTitleControl.ts/TabsTitleControl/computeHeight
class TabsTitleControl:	private computeHeight(): IEditorGroupTitleHeight {
		let total: number;

		// Wrap: we need to ask `offsetHeight` to get
		// the real height of the title area with wrapping.
		if (this.accessor.partOptions.wrapTabs && this.tabsAndActionsContainer?.classList.contains('wrapping')) {
			total = this.tabsAndActionsContainer.offsetHeight;
		} else {
			total = TabsTitleControl.TAB_HEIGHT;
		}

		const offset = total;

		// Account for breadcrumbs if visible
		if (this.breadcrumbsControl && !this.breadcrumbsControl.isHidden()) {
			total += BreadcrumbsControl.HEIGHT; // Account for breadcrumbs if visible
		}

		return { total, offset };
	}