Bug#688219: devscripts: [debdiff] optionally apply 3.0 (quilt) patches before diffing

[Simon McVittie]

Package: devscripts
Version: 2.12.3
Severity: wishlist

Suppose you have this version sequence:

foo 1.2.3-1 (upstream release)
foo 1.2.3-2 (Debian maintainer applies patches)
foo 1.2.4-1 (upstream applies our patches, and makes more fixes)

and now you want to get 1.2.3-2 -> 1.2.4-1 reviewed by the release team,
or read its diff yourself for QA, or whatever. The most representative diff
to use is between the patched source trees that we compile: it's distracting
for the diffstat to include a bunch of changes that were accepted upstream
moving from debian/patches/foo to upstream source changes.

(More concretely, telepathy-mission-control-5 1:5.12.1-1, 1:5.12.1-3 and
1:5.12.3-1 had this happen.)

I attach a crude version of this change.
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