Benjamin Berg authored Oct 01, 2018 and Georges Basile Stavracas Neto committed Oct 04, 2018

There was an issue where the "minor" axis snapping would not be done if
the "major" axis snapping had a zero distance. This could be seen when e.g.
moving a monitor on the right up/down slightly. In that case, no
snapping to align the bottom/top edges were done unless you also moved
the mouse sideways a bit.

Fixes #211


(cherry picked from commit 22a512f0)