>>>> Well, can I install diff-kill-trailing-whitespace
>>>> and diff-show-trailing-whitespace into diff-mode?
>>>>         
>>> I haven't had time to look at the code, but assuming it's clean enough,
>>> I don't see any problem with it,
>>>       
>> Ok, shouldn't Óscar Fuentes <ofv@wanadoo.es> sign papers before
>> code installation?
>>     
>
> I think so.  But I haven't kept track of this thread enough to know
> which part of the code is his and which is yours.
>   

Attached there are the following files:

    original.el --- contains the original proposal from Óscar Fuentes

    modified.el --- contains the modified proposal by me