[QGIS-trac] [Quantum GIS] #3288: Enable stacked layers selection for "Simplify Feature"

[Quantum GIS]

#3288: Enable stacked layers selection for "Simplify Feature"
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   Reporter:  jrm                               |              Owner:  nobody       
       Type:  enhancement                       |             Status:  new          
   Priority:  minor: annoyance                  |          Milestone:  Version 1.7.0
  Component:  Digitising                        |            Version:               
   Keywords:  simplify;feature,stack;selection  |   Platform_version:               
   Platform:  All                               |           Must_fix:  No           
Status_info:  0                                 |  
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 The "Simplify Feature" tool from the "Advanced Digitizing" toolbar can't
 be used on a geometry if this one is completely under another geometry.
 Even with a snapping tolerance added, if you click on one of its vertex or
 segments the entity which will be selected will be the top one.

 A workaround is to do a live query on the layer to filter out the top
 geometry to get access to the one you want but this become tedious when
 you’ve to repeat this operation twenty times.

 A solution similar to the identify tool could be used here :
 1. click on a polygon
 2. qgis lists all the geometries under your mouse for the selected layer
 3. choose the right item and apply the simplification

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3288>
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