Bug#853044: gnome-themes-standard-data: Adwaita Dark is missing gtk.css for gkt3

[Pr0metheus]

Package: gnome-themes-standard-data
Version: 3.22.2-1
Severity: important

Dear Maintainer,

   * What led up to the situation?

I changed my theme to Adwaita Dark

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

I noticed that sometimes strange things happen to the programs especially when
switching, like activity bar going black but I cannot suggest how to reproduce
this. As the Adwaita (not Dark) works with no problems, I believe the change to
Adwaita dark caused these. This happened at least 3 times with Evolution (mail
client) after hitting Super or changing with other windows

   * What was the outcome of this action?

Activity bar randomly goes black.

   * What outcome did you expect instead?

Normal.

Other notes:

I did a search in the folders of /usr/share/themes/Adwaita-dark and compared
with Adawaita, I noticed that the gtk3 files are missing. I then went to github
and saw that there are gtk3 files for Adwaita dark (gtk.css).



-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

-- no debconf information