Public bug reported:

1. Have GTK 3.20 and a fixed ubuntu-themes, for example from yakkety-proposed 
or ppa:ubuntu-desktop/gtk320
2. Run `lightdm --test-mode'
3. Enter your password if prompted, and maxmimise the window
4. See Unity Greeter
5. Focus the password prompt and press enter, or get your password wrong
alternative 5. Click the session switcher if you have more than one session 
installed

The password prompt disappears, or a blank box is drawn instead of the
list of sessions. You can scroll (down, up) to get the password prompt
back, or you can click towards the top left of the window to dismiss the
session switcher and get back to the list.

Bisecting throws up
<https://git.gnome.org/browse/gtk+/commit/?id=6866d1c06e338002bf584b0b9529154e33b5e86a>.
Reverting this does not fix things, so it's not the full story, but it
suggests that unity-greeter needs to do its drawing differently somehow.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: unity-greeter 16.10.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-33.52-generic 4.4.15
Uname: Linux 4.4.0-33-generic x86_64
ApportVersion: 2.20.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Aug  2 12:14:39 2016
InstallationDate: Installed on 2012-10-07 (1394 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20121007)
SourcePackage: unity-greeter
UpgradeStatus: Upgraded to yakkety on 2013-05-07 (1183 days ago)

** Affects: unity-greeter (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages yakkety

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https://bugs.launchpad.net/bugs/1608908

Title:
  Some UI elements are invisible with GTK 3.20

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