GTK applications using dark variant by default, uses light variant if Adwaita theme is not set by default

[Bastián Díaz]

Hello, I have noticed this problem only in distributed applications as 
Flatpak and wanted to know if it is a known problem, and that in the 
future even Flatpak applications could use the theme set by the user 
instead of using only Adwaita.

In short, only when using Adwaita default theme, the Flatpak GTK 
applications that prefer the dark variant use this version, otherwise if 
user use any other theme, the light variant is shown. The problem with 
this is that a somewhat strange mix shown on many occasions. For 
example:

https://cloud.woelkli.com/index.php/s/4QHuxzYAib3wjTV

(Tested in Fedora 24 64 bit: Gnome, XFCE and Budgie)

Related bug: https://phabricator.freedesktop.org/T7490

Cheer

--
Bastián