Bug#834526: gnome-shell: Application icon in "side panel" lacks transparency

[Jason Crain]

On Tue, Aug 16, 2016 at 07:27:11PM +0200, Felix Natter wrote:
> I am the maintainer of a java called freeplane [1], which has an icon
> with transparent edges. However, in current Debian unstable, the edges
> are no longer transparent in GNOME3's left icon panel. See the green
> icon in the attached screen shot.

FWIW, I tried this with Debian testing and unstable, I set freeplane as
a favorite to add it to the icon panel / dash, and the icon shows up
fine with a transparent background.  On both xorg and wayland, if that
makes a difference.