xfce4-screenshooter saves screenshots even when Cancel is pressed, it's been fixed in SVN trunk which seems to have other issues at the moment. This is a reminder bug for myself, but if anyone else in xfce herd feels like backporting the fix from there OR from Debian where it's fixed feel free.
Created attachment 123527 [details, diff] debian's patch here we go ;)
Thanks angelos, applied in 1.0.0-r1