[QGIS-trac] [Quantum GIS] #2352: map is drawn twice on toggling a layer's visibility

[Quantum GIS]

#2352: map is drawn twice on toggling a layer's visibility
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   Reporter:  smizuno           |              Owner:  nobody       
       Type:  bug               |             Status:  new          
   Priority:  minor: annoyance  |          Milestone:  Version 1.5.0
  Component:  Map Legend        |            Version:  HEAD         
   Keywords:                    |   Platform_version:               
   Platform:  All               |           Must_fix:  No           
Status_info:  0                 |  
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 The map is drawn twice on toggling a layer's visibility.

 show the problem:[[BR]]
 1. load two layers (can be the same; linestrings with lots of points helps
 to see the problem) [[BR]]
 2. turn on incremental drawing (this is to make the drawing more
 noticeable)[[BR]]
 3. turn off render caching (to be more noticeable)[[BR]]
 4. as you toggle layer visibility off and on observe the map being drawn
 twice on each toggle. Also, the wait cursor is put up twice.

 The incremental drawing and render caching don't affect the problem.

 This was noticed on Windows, but I believe all platforms are affected.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/2352>
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Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats