Unnecessary overshoot effect at window edges

Submitted by Manuel Grießmayr

Assigned to Igor @f2404

Link to original bug (#16648)

Description

Created attachment 9683 Image of ristretto with Numix theme

See screenshot attached. Problem appears only with Numix theme. It doesn't matter if an image has been opened within the image viewer or not. My OS is Xubuntu 20.04 Beta on real hardware ;)

Attachment 9683, "Image of ristretto with Numix theme":

Version: 0.10.0