Florian Müllner authored Jul 19, 2018 and Florian Müllner committed Jul 30, 2018

Graphical applications like GIMP or GIMP allow picking colors from
any location on-screen. In order to keep supporting this feature
on wayland and in sandboxed apps, we will expose an appropriate
method in the Screenshot interface, so first add a corresponding
method to ShellScreenshot.

GNOME/gnome-shell#286