[QGIS-trac] Re: [Quantum GIS] #1016: mysterious white box obscures data in the map window

[Quantum GIS]

#1016: mysterious white box obscures data in the map window
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        Reporter:  rgaston                           |         Owner:  nobody                            
            Type:  defect                            |        Status:  new                               
        Priority:  major: does not work as expected  |     Milestone:  Version 1.0.0                     
       Component:  Graphics                          |       Version:  HEAD                              
      Resolution:                                    |      Keywords:  obscuring box, digitizing, zooming
Platform_version:                                    |      Platform:  All                               
        Must_fix:  No                                |   Status_info:  0                                 
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Comment (by smizuno):

 more information (based on Windows builds):

 (a work-around) I have discovered that using the Pan Map tool, then
 dragging the mouse to pan even  just a little bit makes the problem go
 away for as long as the QGIS session is used. It is critical that the map
 be panned by the mouse gesture; just clicking on the map or using any
 other tool or even keyboard panning does not affect the problem.

 In addition, if a tool bar is moved around and the map canvas is resized
 so the toolbar can be docked also makes the problem go away.

 The white box is actually the background color.

 Most any tool that involves a mouse drag gesture will cause the obscuring
 box in at least some situations.

 Using the zoom in/zoom out tools may result in a box that is partially
 obscuring the map, depending on how fast the mouse is dragged.

 A tool bar that drops over the map canvas also leaves a blank area behind.

 Once the map is panned by the mouse there is still a box that flashes
 momentarily while zooming or panning. It changes size with zooming and
 moves with panning, so I believe there is an object hanging around on some
 layer.

 The problem first appeared with version 0.9.0, I believe.

 I have not noticed this problem on my Linux installation, but also have
 not tested very much.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/1016#comment:3>
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