When an image or portion of text in a pdf is clicked in Evince, dragged (as if to drag it to another application), then let go of, Evince will continue to scroll depending on where the pointer is placed, even if the window or workspace is changed. The user's place is quickly lost.

To reproduce:

1.) Open a pdf with Evince.
2.) Left click on an image or page of a if it is an image, or select some text.
3.) With the left mouse button held down, drag it so that the "hand holding a document" icon appears.
4.) Let go of the left mouse button.
5.) Go to another window or desktop, and note that depending on the location of the mouse on the screen Evince, even unfocused, will scroll the pdf in that direction (e.g. up if the mouse is near the top).

The only way to stop Evince from scrolling is to go back to Evince and click or scroll again.

I've tested this on with Evince 3.18.2 on Ubuntu 16.04.

Previously reported here:
https://bugs.launchpad.net/ubuntu/+source/evince/+bug/1650076