src/vs/workbench/services/history/browser/history.ts/HistoryService/openPreviouslyUsedEditor
class HistoryService:	openPreviouslyUsedEditor(groupId?: GroupIdentifier): void {
		const [stack, index] = this.ensureRecentlyUsedStack(index => index + 1, groupId);

		this.doNavigateInRecentlyUsedEditorsStack(stack[index], groupId);
	}