src/vs/workbench/contrib/terminal/browser/terminalTabbedView.ts/TerminalTabbedView/_getAdditionalWidth
class TerminalTabbedView:	private _getAdditionalWidth(instance: ITerminalInstance): number {
		// Size to include padding, icon, status icon (if any), split annotation (if any), + a little more
		const additionalWidth = 40;
		const statusIconWidth = instance.statusList.statuses.length > 0 ? WidthConstants.StatusIcon : 0;
		const splitAnnotationWidth = (this._terminalGroupService.getGroupForInstance(instance)?.terminalInstances.length || 0) > 1 ? WidthConstants.SplitAnnotation : 0;
		return additionalWidth + splitAnnotationWidth + statusIconWidth;
	}