[OpenLayers-Trac] [OpenLayers] #3265: Event when a tile fails to load

[OpenLayers]

#3265: Event when a tile fails to load
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 Reporter:  karstenpihl  |       Owner:              
     Type:  feature      |      Status:  new         
 Priority:  minor        |   Milestone:  2.11 Release
Component:  general      |     Version:  2.10        
 Keywords:               |       State:              
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 When a tile fails to load the OpenLayers.Util.onImageLoadError takes
 care of handling the error and the "loadend" event is called without
 any indication on if one or more tiles are missing.

 Attached patch add support for layer events when a tile has failed
 loading. When a single tile is missing it trigger the event
 "loadwarning" to indicate that something is wrong with this layer.
 When all the tiles in a layer are missing it trigger the event
 "loadfail".

 The patch includes an update to the event.html example.

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Ticket URL: <http://trac.openlayers.org/ticket/3265>
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