Add duplicated items to parent group.

Fixes https://gitlab.com/kicad/code/kicad/issues/10155

include/board_item.h

@@ -187,13 +187,7 @@ public:
     /**
      * Create a copy of this #BOARD_ITEM.
      */
-    virtual BOARD_ITEM* Duplicate() const
-    {
-        EDA_ITEM* dupe = Clone();
-        const_cast<KIID&>( dupe->m_Uuid ) = KIID();
-
-        return static_cast<BOARD_ITEM*>( dupe );
-    }
+    virtual BOARD_ITEM* Duplicate() const;
 
     /**
      * Swap data between \a aItem and \a aImage.

pcbnew/board_item.cpp

@@ -154,6 +154,18 @@ void BOARD_ITEM::SwapData( BOARD_ITEM* aImage )
 }
 
 
+BOARD_ITEM* BOARD_ITEM::Duplicate() const
+{
+    BOARD_ITEM* dupe = static_cast<BOARD_ITEM*>( Clone() );
+    const_cast<KIID&>( dupe->m_Uuid ) = KIID();
+
+    if( dupe->GetParentGroup() )
+        dupe->GetParentGroup()->AddItem( dupe );
+
+    return static_cast<BOARD_ITEM*>( dupe );
+}
+
+
 void BOARD_ITEM::TransformShapeWithClearanceToPolygon( SHAPE_POLY_SET& aCornerBuffer,
                                                        PCB_LAYER_ID aLayer, int aClearanceValue,
                                                        int aError, ERROR_LOC aErrorLoc,

pcbnew/footprint.cpp

@@ -1768,15 +1768,14 @@ void FOOTPRINT::SetOrientation( const EDA_ANGLE& aNewAngle )
 
 BOARD_ITEM* FOOTPRINT::Duplicate() const
 {
-    FOOTPRINT* dupe = (FOOTPRINT*) Clone();
-    const_cast<KIID&>( dupe->m_Uuid ) = KIID();
+    FOOTPRINT* dupe = static_cast<FOOTPRINT*>( BOARD_ITEM::Duplicate() );
 
     dupe->RunOnChildren( [&]( BOARD_ITEM* child )
                          {
                              const_cast<KIID&>( child->m_Uuid ) = KIID();
                          });
 
-    return static_cast<BOARD_ITEM*>( dupe );
+    return dupe;
 }