Quoted from Tommy Pettersson:
'Changes -v' shows both adds and removes, but 'Changes -s' shows
only the removes, so something is at least inconsistent.

and

The simples and safest solution looks like making changes -s
show both A and R.

For context:
http://www.abridgegame.org/pipermail/darcs-users/2006-May/010033.html
and
http://www.abridgegame.org/pipermail/darcs-users/2006-June/010035.html

I seem to see this working fine in stable 1.0.8 on gnu/linux. I haven't been
able to pinpoint any change that fixed it though.

See the case explained in http://progetti.arstecnica.it/tailor/ticket/71 
I'm afraid it's much easier fixing darcs than writing a workaround in 
tailor...

This error seems to be caused by PatchViewing::gen_summary.  Its sub-function 
"combine" combines patches if they relate to the same file.  An AddFile and a 
RmFile will be combined.

AddFile is represented by an Int triple (-1,0,0), RmFile by (0,-1,0).  The 
combined triple is (-1,-1,0).  The definition of summ later on matches this as 
RmFile.

I think that there should be either a separate case for an add and remove at the 
same time, or this combination should not be combined in the first place.

fixed in 1.0.9