Zooming when adding region breaks

[daqst]

Version:

 @ryersonlibrary/web-components@0.4.2

I'm submitting a:

[X] bug report
[ ] feature request

Current behavior:
In the MapEditor demo, when adding a region, zooming in or out on the map skews the location of the next point relative to the cursor.

Expected behavior:
The point should follow the cursor as the map zooms.

Steps to reproduce:

• Run npm start.
• Load the MapEditor component demo.
• Add a new Region.
• Click to add one or more points, then scroll the mouse wheel to zoom.
• The polygon point that should follow the cursor is now offset.

Other information:
Probably something to do with scaling not being properly carried over to the last point of the polygon during zooming.