src/vs/workbench/browser/parts/editor/tabsTitleControl.ts/TabsTitleControl/withTab
class TabsTitleControl:	private withTab(editor: IEditorInput, fn: (editor: IEditorInput, index: number, tabContainer: HTMLElement, tabLabelWidget: IResourceLabel, tabLabel: IEditorInputLabel, tabActionBar: ActionBar) => void): void {
		this.doWithTab(this.group.getIndexOfEditor(editor), editor, fn);
	}