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