Expose through iface methods to copy/paste features between given layers

That is, no need to load layers into the layer tree nor make them active.

python/gui/qgisinterface.sip

@@ -767,6 +767,16 @@ Start a blank project
  :rtype: bool
 %End
 
+    virtual void copyFeatures( QgsMapLayer * ) = 0;
+%Docstring
+Copy selected features from the layer to clipboard
+%End
+
+    virtual void pasteFeatures( QgsMapLayer * ) = 0;
+%Docstring
+Paste features from clipboard to the layer
+%End
+
     virtual int addToolBarIcon( QAction *qAction ) = 0;
 %Docstring
 Add an icon to the plugins toolbar

src/app/qgisappinterface.cpp

@@ -186,6 +186,16 @@ bool QgisAppInterface::setActiveLayer( QgsMapLayer *layer )
   return qgis->setActiveLayer( layer );
 }
 
+void QgisAppInterface::copyFeatures( QgsMapLayer *layer )
+{
+  return qgis->editCopy( layer );
+}
+
+void QgisAppInterface::pasteFeatures( QgsMapLayer *layer )
+{
+  return qgis->editPaste( layer );
+}
+
 void QgisAppInterface::addPluginToMenu( const QString &name, QAction *action )
 {
   qgis->addPluginToMenu( name, action );

src/app/qgisappinterface.h

@@ -96,6 +96,12 @@ class APP_EXPORT QgisAppInterface : public QgisInterface
     //! set the active layer (layer selected in the legend)
     bool setActiveLayer( QgsMapLayer *layer ) override;
 
+    //! Copy selected features from the layer to clipboard
+    virtual void copyFeatures( QgsMapLayer *layer ) override;
+
+    //! Paste features from clipboard to the layer
+    virtual void pasteFeatures( QgsMapLayer *layer ) override;
+
     //! Add an icon to the plugins toolbar
     int addToolBarIcon( QAction *qAction ) override;
 

src/gui/qgisinterface.h

@@ -422,6 +422,12 @@ class GUI_EXPORT QgisInterface : public QObject
      */
     virtual bool setActiveLayer( QgsMapLayer * ) = 0;
 
+    //! Copy selected features from the layer to clipboard
+    virtual void copyFeatures( QgsMapLayer * ) = 0;
+
+    //! Paste features from clipboard to the layer
+    virtual void pasteFeatures( QgsMapLayer * ) = 0;
+
     //! Add an icon to the plugins toolbar
     virtual int addToolBarIcon( QAction *qAction ) = 0;