[QGIS-trac] [Quantum GIS] #2302: render caching places map in wrong place when re-enabling

[Quantum GIS]

#2302: render caching places map in wrong place when re-enabling
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   Reporter:  smizuno                           |              Owner:  nobody       
       Type:  bug                               |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.4.0
  Component:  MapCanvas                         |            Version:  HEAD         
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  Yes          
Status_info:  0                                 |  
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 simple steps to reproduce with new project:[[BR]]
 1. caching ON[[BR]]
 2. load map layer[[BR]]
 3. caching OFF[[BR]]
 4. pan map a noticeable amount[[BR]]
 5. caching ON[[BR]]
 -- the map is drawn at its original location (when loaded) AND reading the
 cursor location is wrong since the map extents set by the panning haven't
 changed.

 6. caching OFF[[BR]]
 -- now the map is drawn at the previously panned location and reading the
 cursor location is correct.


 I believe the cached map should be invalidated (dump the cache) when
 caching is turned off, hence the map will be totally re-drawn when caching
 is enabled.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/2302>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats