Comment 2 for bug 1191390

Fair enough. I put easy-to-fix because no knowledge specific to pinta seems to be needed (just some miscalculated for loops that need fixing).

Honestly, I'll give this a go. If I can't fix it in a week from now, I'll un-assign myself. I assume I just branch and push like it says here? `https://code.launchpad.net/pinta`