bug#57400: 29.0.50; Support sending patches from VC directly

[Philip Kaludercic]

Dmitry Gutov <dgutov@yandex.ru> writes:

>> The main issue I see here is that 'next-revision' requires a file
>> argument.  What should that be?
>
> The 'mergebase' and 'print-log' actions don't seem to require it.

I am not sure if this might help, but it seems that (vc-deduce-fileset
t) could give some useful information?