Bug#890904: diffoscope does not show classes.dex diff

[Hans-Christoph Steiner]

Package: diffoscope
Version: 90~bpo9+1

Attached are two APKs that have different classes.dex files.  They are
the same size, but have different contents.  diffoscope does not show a
diff for them.  When I extract the classes.dex files from the APK, diff
and vbindiff do show the differences.

Here are the test files:
https://verification.f-droid.org/tmp/a2dp.Vol_137.apk
https://verification.f-droid.org/tmp/sigcp_a2dp.Vol_137.apk

And the report:
https://verification.f-droid.org/tmp/a2dp.Vol_137.apk.diffoscope.txt
https://verification.f-droid.org/tmp/a2dp.Vol_137.apk.diffoscope.html