Remove the deep copy functionality

python/core/qgsmaplayer.sip

@@ -67,10 +67,10 @@ class QgsMapLayer : QObject
     virtual ~QgsMapLayer();
 
 
-    virtual QgsMapLayer *clone( bool deep ) const = 0;
+    virtual QgsMapLayer *clone() const = 0;
 %Docstring
- Returns a new instance equivalent to this one.
- \param deep If true, a deep copy is done
+ Returns a new instance equivalent to this one except for the id which
+  is still unique.
  :return: a new layer instance
 .. versionadded:: 3.0
  :rtype: QgsMapLayer
@@ -1045,12 +1045,10 @@ Signal emitted when the blend mode is changed, through QgsMapLayer.setBlendMode(
 
   protected:
 
-    void clone( QgsMapLayer *layer, bool deep = false ) const;
+    void clone( QgsMapLayer *layer ) const;
 %Docstring
- Copies attributes like name, short name, ... into another layer. The
-  unique ID is copied too if deep parameter is true.
+ Copies attributes like name, short name, ... into another layer.
  \param layer The copy recipient
- \param deep To copy the unique ID or not
 .. versionadded:: 3.0
 %End
 

python/core/qgspluginlayer.sip

@@ -26,7 +26,7 @@ In order to be readable from project files, they should set these attributes in
     QgsPluginLayer( const QString &layerType, const QString &layerName = QString() );
     ~QgsPluginLayer();
 
-    virtual QgsPluginLayer *clone( bool deep ) const = 0;
+    virtual QgsPluginLayer *clone() const = 0;
 %Docstring
  Returns a new instance equivalent to this one.
  \param deep If true, a deep copy is done

python/core/qgsvectorlayer.sip

@@ -334,13 +334,12 @@ class QgsVectorLayer : QgsMapLayer, QgsExpressionContextGenerator, QgsFeatureSin
     virtual ~QgsVectorLayer();
 
 
-    virtual QgsVectorLayer *clone( bool deep = false ) const /Factory/;
+    virtual QgsVectorLayer *clone() const /Factory/;
 %Docstring
  Returns a new instance equivalent to this one. A new provider is
   created for the same data source and renderers for features and diagrams
   are cloned too. Moreover, each attributes (transparency, extent, selected
   features and so on) are identicals.
- \param deep If true, a deep copy is done (unique ID is copied too)
  :return: a new layer instance
 .. versionadded:: 3.0
  :rtype: QgsVectorLayer

python/core/raster/qgsrasterlayer.sip

@@ -43,11 +43,10 @@ class QgsRasterLayer : QgsMapLayer
 
     /** Returns a new instance equivalent to this one. A new provider is
      *  created for the same data source and renderer is cloned too.
-     * \param deep If true, a deep copy is done (unique ID is copy too)
      * \returns a new layer instance
      * \since QGIS 3.0
      */
-    virtual QgsRasterLayer *clone( bool deep = true ) const /Factory/;
+    virtual QgsRasterLayer *clone() const /Factory/;
 
     /** \brief This enumerator describes the types of shading that can be used */
     enum ColorShadingAlgorithm

src/core/qgsmaplayer.cpp

@@ -94,7 +94,7 @@ QgsMapLayer::~QgsMapLayer()
   delete mStyleManager;
 }
 
-void QgsMapLayer::clone( QgsMapLayer *layer, bool deep ) const
+void QgsMapLayer::clone( QgsMapLayer *layer ) const
 {
   layer->setBlendMode( blendMode() );
 
@@ -123,11 +123,6 @@ void QgsMapLayer::clone( QgsMapLayer *layer, bool deep ) const
   layer->setDependencies( dependencies() );
   layer->setCrs( crs() );
   layer->setCustomProperties( mCustomProperties );
-
-  if ( deep )
-  {
-    layer->setId( id() );
-  }
 }
 
 QgsMapLayer::LayerType QgsMapLayer::type() const
@@ -140,11 +135,6 @@ QString QgsMapLayer::id() const
   return mID;
 }
 
-void QgsMapLayer::setId( const QString &id )
-{
-  mID = id;
-}
-
 void QgsMapLayer::setName( const QString &name )
 {
   QString newName = capitalizeLayerName( name );

src/core/qgsmaplayer.h

@@ -110,12 +110,12 @@ class CORE_EXPORT QgsMapLayer : public QObject
     //! QgsMapLayer cannot be copied
     QgsMapLayer &operator=( QgsMapLayer const & ) = delete;
 
-    /** Returns a new instance equivalent to this one.
-     * \param deep If true, a deep copy is done
+    /** Returns a new instance equivalent to this one except for the id which
+     *  is still unique.
      * \returns a new layer instance
      * \since QGIS 3.0
      */
-    virtual QgsMapLayer *clone( bool deep ) const = 0;
+    virtual QgsMapLayer *clone() const = 0;
 
     /** Returns the type of the layer.
      */
@@ -930,13 +930,11 @@ class CORE_EXPORT QgsMapLayer : public QObject
 
   protected:
 
-    /** Copies attributes like name, short name, ... into another layer. The
-     *  unique ID is copied too if deep parameter is true.
+    /** Copies attributes like name, short name, ... into another layer.
      * \param layer The copy recipient
-     * \param deep To copy the unique ID or not
      * \since QGIS 3.0
      */
-    void clone( QgsMapLayer *layer, bool deep = false ) const;
+    void clone( QgsMapLayer *layer ) const;
 
     //! Set the extent
     virtual void setExtent( const QgsRectangle &rect );
@@ -1031,11 +1029,6 @@ class CORE_EXPORT QgsMapLayer : public QObject
 
   private:
 
-    /** Set the unique id of the layer.
-     * /param id the new unique id of the layer
-     */
-    void setId( const QString &id );
-
     /**
      * This method returns true by default but can be overwritten to specify
      * that a certain layer is writable.

src/core/qgspluginlayer.h

@@ -41,7 +41,7 @@ class CORE_EXPORT QgsPluginLayer : public QgsMapLayer
      * \returns a new layer instance
      * \since QGIS 3.0
      */
-    virtual QgsPluginLayer *clone( bool deep ) const override = 0;
+    virtual QgsPluginLayer *clone() const override = 0;
 
     //! Return plugin layer type (the same as used in QgsPluginLayerRegistry)
     QString pluginLayerType();

src/core/qgsvectorlayer.cpp

@@ -202,10 +202,10 @@ QgsVectorLayer::~QgsVectorLayer()
   delete mConditionalStyles;
 }
 
-QgsVectorLayer *QgsVectorLayer::clone( bool deep ) const
+QgsVectorLayer *QgsVectorLayer::clone() const
 {
   QgsVectorLayer *layer = new QgsVectorLayer( source(), originalName(), mProviderKey );
-  QgsMapLayer::clone( layer, deep );
+  QgsMapLayer::clone( layer );
 
   QList<QgsVectorLayerJoinInfo> joins = vectorJoins();
   Q_FOREACH ( QgsVectorLayerJoinInfo join, joins )

src/core/qgsvectorlayer.h

@@ -404,11 +404,10 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
      *  created for the same data source and renderers for features and diagrams
      *  are cloned too. Moreover, each attributes (transparency, extent, selected
      *  features and so on) are identicals.
-     * \param deep If true, a deep copy is done (unique ID is copied too)
      * \returns a new layer instance
      * \since QGIS 3.0
      */
-    virtual QgsVectorLayer *clone( bool deep = false ) const override SIP_FACTORY;
+    virtual QgsVectorLayer *clone() const override SIP_FACTORY;
 
     //! Returns the permanent storage type for this layer as a friendly name.
     QString storageType() const;

src/core/raster/qgsrasterlayer.cpp

@@ -144,10 +144,10 @@ QgsRasterLayer::~QgsRasterLayer()
   // Note: provider and other interfaces are owned and deleted by pipe
 }
 
-QgsRasterLayer *QgsRasterLayer::clone( bool deep ) const
+QgsRasterLayer *QgsRasterLayer::clone() const
 {
   QgsRasterLayer *layer = new QgsRasterLayer( source(), originalName(), mProviderKey );
-  QgsMapLayer::clone( layer, deep );
+  QgsMapLayer::clone( layer );
   layer->setRenderer( renderer()->clone() );
   return layer;
 }

src/core/raster/qgsrasterlayer.h

@@ -190,11 +190,10 @@ class CORE_EXPORT QgsRasterLayer : public QgsMapLayer
 
     /** Returns a new instance equivalent to this one. A new provider is
      *  created for the same data source and renderer is cloned too.
-     * \param deep If true, a deep copy is done (unique ID is copy too)
      * \returns a new layer instance
      * \since QGIS 3.0
      */
-    virtual QgsRasterLayer *clone( bool deep = false ) const override SIP_FACTORY;
+    virtual QgsRasterLayer *clone() const override SIP_FACTORY;
 
     //! \brief This enumerator describes the types of shading that can be used
     enum ColorShadingAlgorithm

tests/src/python/test_qgsvectorlayer.py

@@ -2195,16 +2195,9 @@ class TestQgsVectorLayer(unittest.TestCase):
     def testCloneId(self):
         layer = createLayerWithFivePoints()
 
-        # deep clone by default
         clone = layer.clone()
         self.assertFalse(clone.id() == layer.id())
 
-        clone = layer.clone(False)
-        self.assertFalse(clone.id() == layer.id())
-
-        clone = layer.clone(True)
-        self.assertEqual(clone.id(), layer.id())
-
     def testCloneVectorLayerAttributes(self):
         # init layer
         layer = createLayerWithFivePoints()