Some minor changes

- QgsVectorLayer *
- make a const copy of a const container
- typo and comments

python/core/auto_generated/qgsvectorlayerutils.sip.in

@@ -177,12 +177,13 @@ are padded with NULL values to match the required length).
 .. versionadded:: 3.4
 %End
 
-    static const QgsFeatureList makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer &layer );
+    static const QgsFeatureList makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer *layer );
 %Docstring
 Converts input ``feature`` to be compatible with the given ``layer``.
 
 This function returns a new list of transformed features compatible with the input
-layer, note that the number of features returned might be greater than one.
+layer, note that the number of features returned might be greater than one when
+converting a multi part geometry to single part
 
 The following operations will be performed to convert the input features:
 - convert single geometries to multi part
@@ -196,13 +197,13 @@ The following operations will be performed to convert the input features:
 .. versionadded:: 3.4
 %End
 
-    static const QgsFeatureList makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer &layer );
+    static const QgsFeatureList makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer *layer );
 %Docstring
 Converts input ``features`` to be compatible with the given ``layer``.
 
 This function returns a new list of transformed features compatible with the input
 layer, note that the number of features returned might be greater than the number
-of input featurers.
+of input features.
 
 The following operations will be performed to convert the input features:
 - convert single geometries to multi part

src/core/qgsvectorlayerutils.cpp

@@ -561,13 +561,13 @@ void QgsVectorLayerUtils::matchAttributesToFields( QgsFeature &feature, const Qg
   }
 }
 
-const QgsFeatureList QgsVectorLayerUtils::makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer &layer )
+const QgsFeatureList QgsVectorLayerUtils::makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer *layer )
 {
-  QgsWkbTypes::Type inputWkbType( layer.wkbType( ) );
+  QgsWkbTypes::Type inputWkbType( layer->wkbType( ) );
   QgsFeatureList resultFeatures;
   QgsFeature newF( feature );
   // Fix attributes
-  QgsVectorLayerUtils::matchAttributesToFields( newF, layer.fields( ) );
+  QgsVectorLayerUtils::matchAttributesToFields( newF, layer->fields( ) );
   // Does geometry need transformations?
   QgsWkbTypes::GeometryType newFGeomType( QgsWkbTypes::geometryType( newF.geometry().wkbType() ) );
   bool newFHasGeom = newFGeomType !=
@@ -579,7 +579,7 @@ const QgsFeatureList QgsVectorLayerUtils::makeFeatureCompatible( const QgsFeatur
   // Drop geometry if layer is geometry-less
   if ( newFHasGeom && ! layerHasGeom )
   {
-    QgsFeature _f = QgsFeature( layer.fields() );
+    QgsFeature _f = QgsFeature( layer->fields() );
     _f.setAttributes( newF.attributes() );
     resultFeatures.append( _f );
   }
@@ -634,7 +634,7 @@ const QgsFeatureList QgsVectorLayerUtils::makeFeatureCompatible( const QgsFeatur
         for ( int i = 0; i < parts->partCount( ); i++ )
         {
           QgsGeometry g( parts->geometryN( i )->clone() );
-          QgsFeature _f( createFeature( &layer, g, attrMap ) );
+          QgsFeature _f( createFeature( layer, g, attrMap ) );
           resultFeatures.append( _f );
         }
       }
@@ -651,12 +651,13 @@ const QgsFeatureList QgsVectorLayerUtils::makeFeatureCompatible( const QgsFeatur
   return resultFeatures;
 }
 
-const QgsFeatureList QgsVectorLayerUtils::makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer &layer )
+const QgsFeatureList QgsVectorLayerUtils::makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer *layer )
 {
   QgsFeatureList resultFeatures;
   for ( const QgsFeature &f : features )
   {
-    for ( const auto &_f : makeFeatureCompatible( f, layer ) )
+    const QgsFeatureList features( makeFeatureCompatible( f, layer ) );
+    for ( const auto &_f : features )
     {
       resultFeatures.append( _f );
     }

src/core/qgsvectorlayerutils.h

@@ -192,7 +192,8 @@ class CORE_EXPORT QgsVectorLayerUtils
      * Converts input \a feature to be compatible with the given \a layer.
      *
      * This function returns a new list of transformed features compatible with the input
-     * layer, note that the number of features returned might be greater than one.
+     * layer, note that the number of features returned might be greater than one when
+     * converting a multi part geometry to single part
      *
      * The following operations will be performed to convert the input features:
      *  - convert single geometries to multi part
@@ -205,14 +206,14 @@ class CORE_EXPORT QgsVectorLayerUtils
      *
      * \since QGIS 3.4
      */
-    static const QgsFeatureList makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer &layer );
+    static const QgsFeatureList makeFeatureCompatible( const QgsFeature &feature, const QgsVectorLayer *layer );
 
     /**
      * Converts input \a features to be compatible with the given \a layer.
      *
      * This function returns a new list of transformed features compatible with the input
      * layer, note that the number of features returned might be greater than the number
-     * of input featurers.
+     * of input features.
      *
      * The following operations will be performed to convert the input features:
      *  - convert single geometries to multi part
@@ -225,7 +226,7 @@ class CORE_EXPORT QgsVectorLayerUtils
      *
      * \since QGIS 3.4
      */
-    static const QgsFeatureList makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer &layer );
+    static const QgsFeatureList makeFeaturesCompatible( const QgsFeatureList &features, const QgsVectorLayer *layer );
 
 };