[QGIS-trac] Re: [Quantum GIS] #978: topological editing with snapping to segment yields 2 vertices instead of 1 adding vertex

[Quantum GIS]

#978: topological editing with snapping to segment yields 2 vertices instead of 1
adding vertex
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        Reporter:  msieczka                                   |         Owner:  timlinux      
            Type:  bug                                        |        Status:  reopened      
        Priority:  critical: causes crash or data corruption  |     Milestone:  Version 0.11.0
       Component:  Digitising                                 |       Version:  HEAD          
      Resolution:                                             |      Keywords:                
Platform_version:                                             |      Platform:  All           
        Must_fix:  Yes                                        |   Status_info:  0             
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Comment (by msieczka):

 Tim,

 I can still reproduce the bug in latest trunk r8750. Follow this please:

 1. Open the attached shapefile in QGIS.

 2. Project properties: check "Enable topological editing".

 3. Project properties > Snapping options: check the layer, Mode: "to
 vertex and segment", Tolerance: "10".

 4. Toggle editing.

 5. Add a vertex, move it - you'll see 3 vertices were added instead of 1.
 The attached screendumps show that it really happens.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/978#comment:8>
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