[QGIS-trac] Re: [Quantum GIS] #2220: Reshape Features works incorrectly with rings(?): shapes differs from postgis/spatialite

[Quantum GIS]

#2220: Reshape Features works incorrectly with rings(?): shapes differs from
postgis/spatialite
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        Reporter:  dr                                |         Owner:  nobody               
            Type:  bug                               |        Status:  new                  
        Priority:  major: does not work as expected  |     Milestone:  Version 1.4.0        
       Component:  Digitising                        |       Version:  HEAD                 
      Resolution:                                    |      Keywords:  reshape features,ring
Platform_version:                                    |      Platform:  All                  
        Must_fix:  No                                |   Status_info:  0                    
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Changes (by lutra):

  * platform:  Windows => All
  * summary:  Reshape Features works incorrect => Reshape Features works
              incorrectly with rings(?): shapes differs from
              postgis/spatialite

Comment:

 Actually I noticed that the vector layer behaves differently if it is
 postgis/spatialite or if is a shapefile.


 After reshaping, the ring becomes a "part" (an island), then:

 *) in postgis/spatialite the island is not selectable nor identifiable. If
 you use the "select features" tool on the main polygon then it then
 selects also the island. The identify tool doesn't work the same, as
 identifying the main polygon do not highlight the island.

 *) with shapefiles the resulting island is both selectable and
 identifiable but only after saving the changes. Before saving changes the
 island in not identifiable nor selectable, as in the above case.

 By the way, is correct the ring become an island after reshaping the
 polygon?

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/2220#comment:1>
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