> I think this should go to master in any case.
>
> Given that tempo.el is not actively maintained lately, I think you can
> install your changes, after taking care of the minor issues below.
>
>> -(defun tempo-invalidate-collection ()
>> +(defun tempo-invalidate-collection (&optional global)
>>    "Marks the tag collection as obsolete.
>> -Whenever it is needed again it will be rebuilt."
>> -  (setq tempo-dirty-collection t))
>> +Whenever it is needed again it will be rebuilt.  When GLOBAL is
>                                                     ^^^^
> Please use "if", not "when".  That's our usual style of describing
> optional arguments.
>
> I think the API changes should be in NEWS.
>
> Thanks.

No problem, I'm attaching a new patch with those corrections applied.

- Fede