With Gnome 3.16, applications like nautilus, totem, file-roller, evince, gnome-calculator and others in other desktop environments (XFCE, KDE) have an ugly frame around their windows now. It's probably a not working shadow.
See e. g. http://i.imgur.com/tNdVSI6.png
(Screenshot made with XFCE and kwin, but it happens with xfwm4, too.
GTK theme = Adwaita-Manjaro. With pure Adwaita, the frame is slightly thinner and white, but still exists.)
This is probably related to https://blogs.gnome.org/fmuellner/2015/01/30/a-small-note-on-window-decorations/
Does anyone know how to get rid of this frame in other DEs?
Thanks.