[QGIS-trac] Re: [Quantum GIS] #2921: Avoid intersection of new polygons.. IS BROKEN

[Quantum GIS]

#2921: Avoid intersection of new polygons.. IS BROKEN
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        Reporter:  pinux                             |         Owner:  mhugent               
            Type:  bug                               |        Status:  reopened              
        Priority:  major: does not work as expected  |     Milestone:  Version 1.7.0         
       Component:  Digitising                        |       Version:  Trunk                 
      Resolution:                                    |      Keywords:  intersection, polygons
Platform_version:                                    |      Platform:  All                   
        Must_fix:  Yes                               |   Status_info:  0                     
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Comment(by mayeulk):

 I can reproduce the bug on the shapefile I attached with those parameters:

 For the shapefile I attached:

 tolerance: 0.000001 (in map units)

 Mode:to vertex and segment

 It is still unclear to me whether there is originally a hole between A and
 B, or if they are OK and only C is wrong. Is there any reliable way to
 check? Visible inspection is useless even at scale>1:1 and postgis does
 not seem reliable here.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/2921#comment:14>
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