[mapguide-trac] #715: Ajax viewer pan/zoom executes two spatial queries on IE7

[MapGuide Open Source]

#715: Ajax viewer pan/zoom executes two spatial queries on IE7
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   Reporter:  trevorwekel  |       Owner:  trevorwekel
       Type:  defect       |      Status:  new        
   Priority:  medium       |   Milestone:             
  Component:  AJAX Viewer  |     Version:  2.0.1      
   Severity:  minor        |    Keywords:             
External_id:  1097918      |  
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 Using IE6 or IE7, the Ajax viewer executes two GETDYNAMICMAPOVERLAY
 requests for each pan/zoom.  This is readily evident using Fiddler.  Since
 two overlay requests are generated, all of the Fdo spatial queries are
 executed twice for every layer.  This reduces !MapGuide performance by a
 factor of two.

 The double request is necessary to support PNG alpha transparency under
 IE6.  It is not required for IE7 since alpha transparency is natively
 supported by IE7.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/715>
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