This morning I woke up. Bad idea.
I find in the work mail a compiler error that I cannot reproduce, so I need to log into a machine at work. But #809195.
I decided to downgrade network-manager. I recall there was a tool to download packages from snapshots.debian.org, I discussed it recently on IRC, let's sync the IRC logs from my server. Or not (#810212).
Never mind, I'll log into the server and grep. Ooh, it's debsnap. However, it doesn't quite do what I hoped (#667712).
After some help from #debian-devel (thanks jcristau and LebedevRI), here is
how to downgrade network-manager:
# echo "deb http://snapshot.debian.org/archive/debian/20151125T155830Z/ sid main" >> /etc/apt/sources.list.d/tmp-downgrade-nm.list
# apt -o Acquire::Check-Valid-Until=false update
# apt -o Acquire::Check-Valid-Until=false install network-manager=1.0.6-1
# rm /etc/apt/sources.list.d/tmp-downgrade-nm.list
# service network-manager restart
And as user:
$ killall nm-applet
$ nm-applet &
The yak is now nice and shaved, I can now go and see what those compiler errors are all about.
Actually, no, there was still an unshaved patch on the yak, and now we have a debcya script.