[mapguide-trac] #963: Ajax viewer pan/zoom executes two spatial queries on Chrome

[MapGuide Open Source]

#963: Ajax viewer pan/zoom executes two spatial queries on Chrome
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 Reporter:  brucedechant  |         Owner:         
     Type:  defect        |        Status:  new    
 Priority:  medium        |     Milestone:         
Component:  AJAX Viewer   |       Version:  2.0.2  
 Severity:  minor         |    Resolution:         
 Keywords:                |   External_id:  1300521
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Comment (by chrisclaydon):

 I've attached a patch that does 2 things:

 1) It handles the "behind-the-scenes" loading of images the same way for
 Chrome that it does for Safari, preventing a stale image from flashing up
 while the new image loads when mouse-wheel zooming.

 2) For Chrome and Safari, we now skip the pre-loading of map and selection
 images into a hidden image. We already have special handling of image
 loads for Safari, making use of one hidden and one visible image. The
 images are swapped each time a new image finishes loading. There is no
 need for an additional hidden image in this setup. This change fixes the
 problem of issuing two requests for each new map image.

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Ticket URL: <http://trac.osgeo.org/mapguide/ticket/963#comment:5>
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