[Chameleon] multiple zoomin before map arrives

[bartvde@xs4all.nl]

Hi list,

when zooming in on the map, sometimes users get impatient (at least a
colleague of mine who just tested the application .... :-( ) and click on
the map again before the map update has finished. In this case the
Chameleon client application will "hang".

The same thing happens when first clicking in the map with the zoomin
tool, and then drawing a box before the map update finishes.

Also when pressing the "update map" button twice too soon, the same thing
happens.

Is there any way to prevent this behaviour? It is a pretty serious issue
in my opinion, as the result can be that the application hangs.

Best regards,
Bart