bug#13004: 24.2; vc-diff from vc-log doesn't show diff before renames (for Mercurial backend).

[Glenn Morris]

Oleksandr Gavenko wrote:

> Additional info.

(Seems more like a different bug report to me.)

> Next go to previous version by "a" (vc-annotate-revision-previous-to-line) on
> second line:
>
>   0 Tue Nov 27 21:12:00 2012 +0200  README: xxx
>   1 Tue Nov 27 21:12:23 2012 +0200  README: yyy          (*1*)
>   3 Tue Nov 27 21:13:15 2012 +0200 INSTALL: zzz
>
> So you move to:
>
>   0 Tue Nov 27 21:12:00 2012 +0200 README: xxx           (*2*)

Emacs is now looking at revision 0 of file "README".

> If you try move forward by "w" (vc-annotate-working-revision) Emacs print
> error:
>
>   vc-annotate-warp-revision: Invalid argument to vc-annotate-warp-revision

Ie, you try to jump to the working revision of file "README".
But file README has no working revision, hence the error.

I have no idea what, if anything, to do about that.