Clone stamp tool resets the relative position on each mouse down

[Cameron White]

Other tools I have used keep all click/drag/paint events using the same origin. But having selected an origin on Pinta, each time I click the paint is with respect to the same origin.

To reproduce:

1. Control+Click on a point - (100,100) as an example
2. Click on new location - (300,300) for example. Content from (100,100) is correctly copied here.
3. Click on another location - (400,400) for example. Content from (100,100) is copied here. That to me is not intuitive, and I'd expect content from (200,200) to be copied here. So if I drag back to (300,300) I'd expect to see content from (200,200) back to (100,100).

I'm sure my expected outcome is what Photo**op would do.

[Cameron White (cameronwhite91)]

Submitted from https://answers.launchpad.net/pinta/+question/707573

[Cameron White (cameronwhite91)]

Fixed by https://github.com/PintaProject/Pinta/commit/351214e738952bc6bd906b3846508611f2ba5c98