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

[Ludovic Pouzenc]

Hi,

Additionnal info : I have disabled the functionnality that open 
"Activity" overlay without any click. (I don't know the right english 
wording about this functionnality). The bug with screenshot occurs even 
in this config.

I was thinking about an uninitialised [0;0] pointer coords in some way 
that triggers the hot spot... but no.

Regards,
Ludovic