Fix fill ring tool creates more features than needed (fix #13354)

(cherry-picked from 45a6f71)

Author: nyalldawson

python/core/qgsvectorlayer.sip

@@ -595,7 +595,9 @@ class QgsVectorLayer : QgsMapLayer
      */
     bool deleteSelectedFeatures( int *deletedCount = 0 );
 
-    /**Adds a ring to polygon/multipolygon features
+    /** Adds a ring to polygon/multipolygon features
+     * @param ring ring to add
+     * @param featureId if specified, feature ID for feature ring was added to will be stored in this parameter
      @return
        0 in case of success,
        1 problem with feature type,
@@ -604,7 +606,7 @@ class QgsVectorLayer : QgsMapLayer
        4 ring crosses existing rings,
        5 no feature found where ring can be inserted
        6 layer not editable */
-    int addRing( const QList<QgsPoint>& ring );
+    int addRing( const QList<QgsPoint>& ring, QgsFeatureId* featureId = 0 );
 
     /**Adds a new part polygon to a multipart feature
      @return

python/core/qgsvectorlayereditutils.sip

@@ -26,14 +26,16 @@ class QgsVectorLayerEditUtils
     bool deleteVertex( QgsFeatureId atFeatureId, int atVertex );
 
     /** Adds a ring to polygon/multipolygon features
+     * @param ring ring to add
+     * @param featureId if specified, feature ID for feature ring was added to will be stored in this parameter
      @return
        0 in case of success,
        1 problem with feature type,
        2 ring not closed,
        3 ring not valid,
        4 ring crosses existing rings,
        5 no feature found where ring can be inserted*/
-    int addRing( const QList<QgsPoint>& ring );
+    int addRing( const QList<QgsPoint>& ring, QgsFeatureId* featureId = 0 );
 
     /** Adds a new part polygon to a multipart feature
      @return

src/app/qgsmaptoolfillring.cpp

@@ -79,7 +79,10 @@ void QgsMapToolFillRing::canvasMapReleaseEvent( QgsMapMouseEvent * e )
     closePolygon();
 
     vlayer->beginEditCommand( tr( "Ring added and filled" ) );
-    int addRingReturnCode = vlayer->addRing( points() );
+    QList< QgsPoint > pointList = points();
+
+    QgsFeatureId modifiedFid;
+    int addRingReturnCode = vlayer->addRing( pointList, &modifiedFid );
     if ( addRingReturnCode != 0 )
     {
       QString errorMessage;
@@ -122,7 +125,7 @@ void QgsMapToolFillRing::canvasMapReleaseEvent( QgsMapMouseEvent * e )
       yMin = std::numeric_limits<double>::max();
       yMax = -std::numeric_limits<double>::max();
 
-      Q_FOREACH ( const QgsPoint& point, points() )
+      Q_FOREACH ( const QgsPoint& point, pointList )
       {
         xMin = qMin( xMin, point.x() );
         xMax = qMax( xMax, point.x() );
@@ -135,18 +138,16 @@ void QgsMapToolFillRing::canvasMapReleaseEvent( QgsMapMouseEvent * e )
       bBox.setXMaximum( xMax );
       bBox.setYMaximum( yMax );
 
-      QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFilterRect( bBox ).setFlags( QgsFeatureRequest::ExactIntersect ) );
+      QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFilterFid( modifiedFid ) );
 
       QgsFeature f;
       bool res = false;
-      while ( fit.nextFeature( f ) )
+      if ( fit.nextFeature( f ) )
       {
         //create QgsFeature with wkb representation
         QgsFeature* ft = new QgsFeature( vlayer->pendingFields(), 0 );
 
-        QgsGeometry *g;
-        g = QgsGeometry::fromPolygon( QgsPolygon() << points().toVector() );
-        ft->setGeometry( g );
+        ft->setGeometry( QgsGeometry::fromPolygon( QgsPolygon() << pointList.toVector() ) );
         ft->setAttributes( f.attributes() );
 
         if ( QgsApplication::keyboardModifiers() == Qt::ControlModifier )

src/core/qgsvectorlayer.cpp

@@ -1065,13 +1065,13 @@ bool QgsVectorLayer::deleteSelectedFeatures( int* deletedCount )
   return deleted == count;
 }
 
-int QgsVectorLayer::addRing( const QList<QgsPoint>& ring )
+int QgsVectorLayer::addRing( const QList<QgsPoint>& ring, QgsFeatureId* featureId )
 {
   if ( !mEditBuffer || !mDataProvider )
     return 6;
 
   QgsVectorLayerEditUtils utils( this );
-  return utils.addRing( ring );
+  return utils.addRing( ring, featureId );
 }
 
 int QgsVectorLayer::addPart( const QList<QgsPoint> &points )

src/core/qgsvectorlayer.h

@@ -958,7 +958,9 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
      */
     bool deleteSelectedFeatures( int *deletedCount = 0 );
 
-    /**Adds a ring to polygon/multipolygon features
+    /** Adds a ring to polygon/multipolygon features
+     * @param ring ring to add
+     * @param featureId if specified, feature ID for feature ring was added to will be stored in this parameter
      @return
        0 in case of success,
        1 problem with feature type,
@@ -967,7 +969,7 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
        4 ring crosses existing rings,
        5 no feature found where ring can be inserted
        6 layer not editable */
-    int addRing( const QList<QgsPoint>& ring );
+    int addRing( const QList<QgsPoint>& ring, QgsFeatureId* featureId = 0 );
 
     /**Adds a new part polygon to a multipart feature
      @return

src/core/qgsvectorlayereditutils.cpp

@@ -97,7 +97,7 @@ bool QgsVectorLayerEditUtils::deleteVertex( QgsFeatureId atFeatureId, int atVert
 }
 
 
-int QgsVectorLayerEditUtils::addRing( const QList<QgsPoint>& ring )
+int QgsVectorLayerEditUtils::addRing( const QList<QgsPoint>& ring, QgsFeatureId* featureId )
 {
   if ( !L->hasGeometryType() )
     return 5;
@@ -125,7 +125,8 @@ int QgsVectorLayerEditUtils::addRing( const QList<QgsPoint>& ring )
     if ( addRingReturnCode == 0 )
     {
       L->editBuffer()->changeGeometry( f.id(), f.geometry() );
-
+      if ( featureId )
+        *featureId = f.id();
       //setModified( true, true );
       break;
     }

src/core/qgsvectorlayereditutils.h

@@ -47,14 +47,16 @@ class CORE_EXPORT QgsVectorLayerEditUtils
     bool deleteVertex( QgsFeatureId atFeatureId, int atVertex );
 
     /** Adds a ring to polygon/multipolygon features
+     * @param ring ring to add
+     * @param featureId if specified, feature ID for feature ring was added to will be stored in this parameter
      @return
        0 in case of success,
        1 problem with feature type,
        2 ring not closed,
        3 ring not valid,
        4 ring crosses existing rings,
        5 no feature found where ring can be inserted*/
-    int addRing( const QList<QgsPoint>& ring );
+    int addRing( const QList<QgsPoint>& ring, QgsFeatureId* featureId = 0 );
 
     /** Adds a new part polygon to a multipart feature
      @return