Make topological vertex moves more robust to rounding differences

git-svn-id: http://svn.osgeo.org/qgis/trunk@9312 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/core/qgssnapper.cpp

@@ -101,15 +101,22 @@ int QgsSnapper::snapPoint( const QPoint& startPoint, QList<QgsSnappingResult>& s
     snappingResult.push_back( evalIt.value() );
   }
   else if ( mSnapMode == QgsSnapper::SEVERAL_RESULTS_SAME_POSITION )
-  {
-
+  {    
+    //take all snapping Results within a certain tolerance because rounding differences may occur
+    double tolerance = 0.000001;
     double minDistance = evalIt.key();
-    QList<QgsSnappingResult> values = snappingResultList.values( minDistance );
-    for ( int i = 0; i < values.size(); ++i )
-    {
-      snappingResult.push_back( values.at( i ) );
-    }
+
+    for(evalIt = snappingResultList.begin(); evalIt != snappingResultList.end(); ++evalIt)
+      {
+	if(evalIt.key() > (minDistance + tolerance))
+	  {
+	    break;
+	  }
+	snappingResult.push_back(evalIt.value());
+      }
+
   }
+
   else //take all results
   {
     for ( ;evalIt != snappingResultList.end(); ++evalIt )