[OpenLayers-Trac] [OpenLayers] #3431: set opacity on layer divs, not on tiles and markers

[OpenLayers]

#3431: set opacity on layer divs, not on tiles and markers
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 Reporter:  ahocevar  |       Owner:  euzuro      
     Type:  feature   |      Status:  new         
 Priority:  minor     |   Milestone:  2.12 Release
Component:  Layer     |     Version:  2.10        
 Keywords:            |       State:              
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 Currently, the setOpacity method is quite expensive, because it sets the
 opacity on all tiles or markers. It is sufficient to set it on the layer
 div. This is another improvement factored out from #3061, and the way it
 is implemented it depends on #3419.

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Ticket URL: <http://trac.openlayers.org/ticket/3431>
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