It loses "from" and "to" using MOEasel resize of "edges"

Originally reported on Google Code with ID 447

```
The zooming on Mondrian looses "from" and "to".

Using MOEasel, viewing basic/Dashed edges, when it use Zoom in action [repetedly] it
loses the "from" and "to" points of the edges.

I'm using Pharo-1.1-11411 Hudson image [moose-latest-dev]
```

Reported by `felipe.valverde.campos` on 2010-09-01 20:20:05
