bug#19045: 25.0.50; [PATCH] vc-git-print-log use --follow

[Juri Linkov]

> Juri, can you please re-check with directories?  They seem to work
> fine here, so disabling them in this case sounds unnecessary.

Please clarify where directories work fine: in git command line
or in Emacs using vc-git?

In the command line of git version 1.9.1 running git log on two files
(command line copied from *Messages* when vc-command-messages is t)

  git --no-pager log --no-color --follow -n 2000 -- vc-dispatcher.el vc-git.el

fails with the error:

  usage: git logs can only follow renames on one pathname at a time

whereas running git on one directory ‘vc’

  git --no-pager log --no-color --follow -n 2000 -- vc

doesn't fail.  Although I can't confirm the correctness of the output log:
it seems the option ‘--follow’ has no effect on directories.

Now there is a different story for vc-git.el.  There are 4 versions of it:

1. the initial version without the option added in ‘vc-git-print-log’
2. the old version that always used "--follow"
3. the previous version that added "--follow" only
   when the arg ‘files’ contains no directories
4. the current version that additionally checks the length of ‘files’
   and adds "--follow" only for a single file in ‘files’.

Which version did you check?