Adwaita is a defined icon theme mandatory installed as dependency to
GTK3.

All GTK apps are allowed to assume the presence of the
Adwaita-icon-theme package; As a result of this, we now accept icons
in icons/Adwaita on the whitelist (just as hicolor).
Merge pull request #1 from DimStar77/master

Adwaita is a defined icon theme mandatory installed as dep to GTK3