Eli Zaretskii <eliz@gnu.org> writes:

> [...] perhaps add-log.el could be extended to be able to use a buffer
> name, not just a file name, for where to put the log messages.  It
> already allows you to customize the file name; it could do something
> similar with a buffer name, and that buffer could have no file name.
> Then a large part of your problems would go away, AFAIU.

Hi Eli,

Find attached a patch that does exactly this.  It is only lightly
tested, so I need a clinical eye that I didn't break anything.
Fortunately, it is quite short.  Appropriately, I used it to compose the
commit message (and I don't have any ChangeLog files lying around).

If this is accepted, I can submit more patches for more related
functionality.  The next two I imagine, in this order, are:

* C-c C-c (commit-time in vc-log) somehow disables the entries collected
  by C-c C-a in the ChangeLog buffer.

* Use a single ChangeLog buffer indexed by projects (Stefan's idea)

Thanks,
João