Bug#783964: gnome-screenshot: Spurious triggers of activity menu while validating screenshot region

[Ludovic Pouzenc]

Hi again,

I think finally gnome-screenshot is not affected while I added huge 
debug in the code... and it clearly does not run at all.
sources.debian.net allows me to see that gnome-screenshot code have been 
duplicated in mate-utils.

Please correct my mistake. (gnome-screenshot => mate-utils)

Regards,
Ludovic