bug#19402: Already-applied patches in 'origin' are automatically reversed

[Mark H Weaver]

Currently, if a patch that we carry in Guix is taken upstream, and then
we update the package, Guix will automatically reverse the patch without
error.

This behavior delayed my xorg-update work for several hours today (I was
stumped and took a break), and I worry that patches that aren't needed
for successful compilation (e.g. security fixes) could be automatically
undone without anyone noticing.

Perhaps the solution is to pass --force (not --batch) to 'patch'.

What do you think?

      Mark