FireFox 4 and 5 focus issue with map div

[ossipoff]

I have run in to some strange behavior of FireFox 4 and 5. The behavior can be reproduced with the attached draw-feature-map-focus-problem.html example file and the guide below.

1) Open the example file in FireFox 4 and click on the "draw polygon" radio button

2) Use the TAB key on your keyboard to set focus on the map div (a focus rect appears around it)

3) Click once in the map to set the first point of the polygon. Observe that the focus rect is still there.

4) Click one more time in the map to set the next point of the polygon. Observe that the focus rect is gone!

If you wonder why I needed the focus on the map div take a look at #1027.