Dear all,

Attached is a patch that solves some of the problems in this issue (not all).

Its main feature is that it should not modify anything if you are not
using `vc-git-print-log-follow`.

If you are, the patch makes it possible to use `a`, `f` and `d` from
inside the `*vc-change-log*` buffer.

The patch itself is very much based on the one proposed in
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=8756#53, with some
changes to make sure that nothing changes if `vc-git-print-log-follow`
is not being used. Additionally, a horrible HACK (see commit message)
is used to allow `vc-git.el` to discriminate between `d` and `D` in
the `*vc-change-log*` buffer, as these two functions require different
Git commands to be executed when following renames (this is also
discussed in the just linked bug report).

Cheers,
Nicolas