Removed:

- ZONE_CONTAINER::m_Netname field
- ZONE_CONTAINER::SetNetName()
- ZONE_CONTAINER::SetNet() [it uses the one in BOARD_CONNECTED_ITEM]
- ZONE_CONTAINER::GetNetName() [instead BOARD_CONNECTED_ITEM::GetNetname is used]
- ZONE_CONTAINER::SetNetNameFromNetCode()

Performed tests:
- Drawn a zone that belongs to a net, then modified schematics so the net does not exist anymore. After reloading the net list, all pads/tracks are updated. Zones still belongs to the net that does not exist in the schematic (but still exists in .kicad_pcb file). After running DRC, the zone becomes not filled.
- Undo & redo affects assignment of a polygon to a specific net (you may change net of a polygon, refill it and undo/redo the changes).

pcbnew/class_board.cpp

@@ -1535,7 +1535,7 @@ int BOARD::SetAreasNetCodesFromNetNames( void )
 
         if( GetArea( ii )->GetNet() != 0 )      // i.e. if this zone is connected to a net
         {
-            const NETINFO_ITEM* net = FindNet( GetArea( ii )->GetNetName() );
+            const NETINFO_ITEM* net = FindNet( GetArea( ii )->GetNetname() );
 
             if( net )
             {
@@ -2720,7 +2720,7 @@ void BOARD::ReplaceNetlist( NETLIST& aNetlist, bool aDeleteSinglePadNets,
                            " has non-existent net name \"%s\" **\n" ),
                         GetChars( coord ),
                         GetChars( zone->GetLayerName() ),
-                        GetChars( zone->GetNetName() ) );
+                        GetChars( zone->GetNetname() ) );
             aReporter->Report( msg );
         }
     }

pcbnew/class_zone.cpp

@@ -138,31 +138,6 @@ const wxPoint& ZONE_CONTAINER::GetPosition() const
 }
 
 
-void ZONE_CONTAINER::SetNet( int aNetCode )
-{
-    BOARD_CONNECTED_ITEM::SetNet( aNetCode );
-
-    if( aNetCode < 0 )
-        return;
-
-    BOARD* board = GetBoard();
-
-    if( board )
-    {
-        NETINFO_ITEM* net = board->FindNet( aNetCode );
-
-        if( net )
-            m_Netname = net->GetNetname();
-        else
-            m_Netname.Empty();
-    }
-    else
-    {
-        m_Netname.Empty();
-    }
-}
-
-
 void ZONE_CONTAINER::Draw( EDA_DRAW_PANEL* panel, wxDC* DC, GR_DRAWMODE aDrawMode,
                            const wxPoint& offset )
 {
@@ -658,7 +633,7 @@ void ZONE_CONTAINER::GetMsgPanelInfo( std::vector< MSG_PANEL_ITEM >& aList )
         else // a netcode < 0 is an error
         {
             msg = wxT( " [" );
-            msg << m_Netname + wxT( "]" );
+            msg << GetNetname() + wxT( "]" );
             msg << wxT( " <" ) << _( "Not Found" ) << wxT( ">" );
         }
 
@@ -849,20 +824,6 @@ void ZONE_CONTAINER::Copy( ZONE_CONTAINER* src )
 }
 
 
-bool ZONE_CONTAINER::SetNetNameFromNetCode( void )
-{
-    NETINFO_ITEM* net;
-
-    if( m_Parent && ( net = ( (BOARD*) m_Parent )->FindNet( GetNet() ) ) )
-    {
-        m_Netname = net->GetNetname();
-        return true;
-    }
-
-    return false;
-}
-
-
 ZoneConnection ZONE_CONTAINER::GetPadConnection( D_PAD* aPad ) const
 {
     if( aPad == NULL || aPad->GetZoneConnection() == UNDEFINED_CONNECTION )
@@ -928,7 +889,7 @@ wxString ZONE_CONTAINER::GetSelectMenuText() const
         else
         {   // A netcode < 0 is an error:
             // Netname not found or area not initialised
-            text << wxT( " [" ) << m_Netname << wxT( "]" );
+            text << wxT( " [" ) << GetNetname() << wxT( "]" );
             text << wxT( " <" ) << _( "Not Found" ) << wxT( ">" );
         }
     }

pcbnew/class_zone.h

@@ -186,31 +186,6 @@ public:
         return ( GetLayer() < FIRST_NON_COPPER_LAYER ) ? true : false;
     }
 
-    /**
-     * Function SetNet
-     * sets the netcode and the netname.
-     *
-     * @param aNetCode The net code of the zone container if greater than or equal to
-     *                 zero.  Otherwise the current net code is kept and set the net
-     *                 code error flag.
-     */
-    virtual void SetNet( int aNetCode );
-
-    /**
-     * Function SetNetNameFromNetCode
-     * Find the net name corresponding to the net code.
-     * @return bool - true if net found, else false
-     */
-    bool SetNetNameFromNetCode( void );
-
-    /**
-     * Function GetNetName
-     * returns the net name.
-     * @return const wxString& - The net name.
-     */
-    const wxString& GetNetName() const                  { return m_Netname; };
-    void SetNetName( const wxString& aName )            { m_Netname = aName; }
-
     /// How to fill areas: 0 = use filled polygons, 1 => fill with segments.
     void SetFillMode( int aFillMode )                   { m_FillMode = aFillMode; }
     int GetFillMode() const                             { return m_FillMode; }
@@ -607,7 +582,6 @@ public:
 
 private:
     CPolyLine*            m_Poly;                ///< Outline of the zone.
-    wxString              m_Netname;             ///< Name of the net assigned to the zone.
     CPolyLine*            m_smoothedPoly;        // Corner-smoothed version of m_Poly
     int                   m_cornerSmoothingType;
     unsigned int          m_cornerRadius;

pcbnew/eagle_plugin.cpp

@@ -2259,7 +2259,6 @@ void EAGLE_PLUGIN::packageHole( MODULE* aModule, CPTREE& aTree ) const
     // no offset, no net name, no pad name allowed
     // pad->SetOffset( wxPoint( 0, 0 ) );
     // pad->SetPadName( wxEmptyString );
-    // pad->SetNetname( wxEmptyString );
 
     wxPoint padpos( kicad_x( e.x ), kicad_y( e.y ) );
 
@@ -2496,7 +2495,6 @@ void EAGLE_PLUGIN::loadSignals( CPTREE& aSignals )
                     zone->SetTimeStamp( timeStamp( it->second ) );
                     zone->SetLayer( layer );
                     zone->SetNet( netCode );
-                    zone->SetNetName( netName );
 
                     CPolyLine::HATCH_STYLE outline_hatch = CPolyLine::DIAGONAL_EDGE;
 
@@ -2552,10 +2550,7 @@ void EAGLE_PLUGIN::loadSignals( CPTREE& aSignals )
             // KiCad does not support an unconnected zone with its own non-zero netcode,
             // but only when assigned netcode = 0 w/o a name...
             for( ZONES::iterator it = zones.begin();  it != zones.end();  ++it )
-            {
                 (*it)->SetNet( 0 );
-                (*it)->SetNetName( wxEmptyString );
-            }
 
             // therefore omit this signal/net.
         }

pcbnew/kicad_plugin.cpp

@@ -1406,7 +1406,7 @@ void PCB_IO::format( ZONE_CONTAINER* aZone, int aNestLevel ) const
     // (perhaps netcode and netname should be not stored)
     m_out->Print( aNestLevel, "(zone (net %d) (net_name %s)",
                   aZone->GetIsKeepout() ? 0 : aZone->GetNet(),
-                  m_out->Quotew( aZone->GetIsKeepout() ? wxT("") : aZone->GetNetName() ).c_str() );
+                  m_out->Quotew( aZone->GetIsKeepout() ? wxT("") : aZone->GetNetname() ).c_str() );
 
     formatLayer( aZone );
 

pcbnew/legacy_plugin.cpp

@@ -2238,7 +2238,6 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
             // the zone net name is the name read in file.
             // (When mismatch, the user will be prompted in DRC, to fix the actual name)
             zc->BOARD_CONNECTED_ITEM::SetNet( netcode );
-            zc->SetNetName( FROM_UTF8( buf ) );     // init the net name here
         }
 
         else if( TESTLINE( "ZLayer" ) )     // layer found
@@ -2255,7 +2254,7 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
 
             if( !hopt )
             {
-                m_error.Printf( wxT( "Bad ZAux for CZONE_CONTAINER '%s'" ), zc->GetNetName().GetData() );
+                m_error.Printf( wxT( "Bad ZAux for CZONE_CONTAINER '%s'" ), zc->GetNetname().GetData() );
                 THROW_IO_ERROR( m_error );
             }
 
@@ -2266,7 +2265,7 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
             case 'F':   outline_hatch = CPolyLine::DIAGONAL_FULL;   break;
 
             default:
-                m_error.Printf( wxT( "Bad ZAux for CZONE_CONTAINER '%s'" ), zc->GetNetName().GetData() );
+                m_error.Printf( wxT( "Bad ZAux for CZONE_CONTAINER '%s'" ), zc->GetNetname().GetData() );
                 THROW_IO_ERROR( m_error );
             }
 
@@ -2283,7 +2282,7 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
 
             if( smoothing >= ZONE_SETTINGS::SMOOTHING_LAST || smoothing < 0 )
             {
-                m_error.Printf( wxT( "Bad ZSmoothing for CZONE_CONTAINER '%s'" ), zc->GetNetName().GetData() );
+                m_error.Printf( wxT( "Bad ZSmoothing for CZONE_CONTAINER '%s'" ), zc->GetNetname().GetData() );
                 THROW_IO_ERROR( m_error );
             }
 
@@ -2358,7 +2357,7 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
 
             default:
                 m_error.Printf( wxT( "Bad ZClearance padoption for CZONE_CONTAINER '%s'" ),
-                    zc->GetNetName().GetData() );
+                    zc->GetNetname().GetData() );
                 THROW_IO_ERROR( m_error );
             }
 
@@ -2422,10 +2421,7 @@ void LEGACY_PLUGIN::loadZONE_CONTAINER()
             // Ensure keepout does not have a net
             // (which have no sense for a keepout zone)
             if( zc->GetIsKeepout() )
-            {
-                zc->SetNet(0);
-                zc->SetNetName( wxEmptyString );
-            }
+                zc->SetNet( 0 );
 
             // should always occur, but who knows, a zone without two corners
             // is no zone at all, it's a spot?
@@ -3644,7 +3640,7 @@ void LEGACY_PLUGIN::saveZONE_CONTAINER( const ZONE_CONTAINER* me ) const
     fprintf( m_fp,  "ZInfo %lX %d %s\n",
                     me->GetTimeStamp(),
                     me->GetIsKeepout() ? 0 : me->GetNet(),
-                    EscapedUTF8( me->GetIsKeepout() ? wxT("") : me->GetNetName() ).c_str() );
+                    EscapedUTF8( me->GetIsKeepout() ? wxT("") : me->GetNetname() ).c_str() );
 
     // Save the outline layer info
     fprintf( m_fp, "ZLayer %d\n", me->GetLayer() );

pcbnew/pcad2kicadpcb_plugin/pcb_polygon.cpp

@@ -172,7 +172,6 @@ void PCB_POLYGON::AddToBoard()
         zone->SetTimeStamp( m_timestamp );
         zone->SetLayer( m_KiCadLayer );
         zone->SetNet( m_netCode );
-        zone->SetNetName( m_net );
 
         // add outline
         int outline_hatch = CPolyLine::DIAGONAL_EDGE;

pcbnew/pcb_parser.cpp

@@ -2423,7 +2423,7 @@ ZONE_CONTAINER* PCB_PARSER::parseZONE_CONTAINER() throw( IO_ERROR, PARSE_ERROR )
 
         case T_net_name:
             NeedSYMBOLorNUMBER();
-            zone->SetNetName( FromUTF8() );
+            assert( m_board->FindNet( zone->GetNet() )->GetNetname() == FromUTF8() );
             NeedRIGHT();
             break;
 
@@ -2699,10 +2699,7 @@ ZONE_CONTAINER* PCB_PARSER::parseZONE_CONTAINER() throw( IO_ERROR, PARSE_ERROR )
 
     // Ensure keepout does not have a net (which have no sense for a keepout zone)
     if( zone->GetIsKeepout() )
-    {
-        zone->SetNet(0);
-        zone->SetNetName( wxEmptyString );
-    }
+        zone->SetNet( 0 );
 
     return zone.release();
 }

pcbnew/specctra_export.cpp

@@ -1557,7 +1557,7 @@ void SPECCTRA_DB::FromBOARD( BOARD* aBoard ) throw( IO_ERROR )
 
             plane->SetShape( mainPolygon );
 
-            plane->name = TO_UTF8( item->GetNetName() );
+            plane->name = TO_UTF8( item->GetNetname() );
 
             if( plane->name.size() == 0 )
             {

pcbnew/zones_by_polygon.cpp

@@ -550,7 +550,6 @@ int PCB_EDIT_FRAME::Begin_Zone( wxDC* DC )
                     zoneInfo.m_NetcodeSelection = GetBoard()->GetHighLightNetCode();
 
                     zone->SetNet( zoneInfo.m_NetcodeSelection );
-                    zone->SetNetNameFromNetCode( );
                 }
                 double tmp = ZONE_THERMAL_RELIEF_GAP_MIL;
                 wxGetApp().GetSettings()->Read( ZONE_THERMAL_RELIEF_GAP_STRING_KEY, &tmp );
@@ -579,7 +578,6 @@ int PCB_EDIT_FRAME::Begin_Zone( wxDC* DC )
                     // Netcode and netname are irrelevant,
                     // so ensure they are cleared
                     zone->SetNet( 0 );
-                    zone->SetNetName( wxEmptyString );
                     edited = InvokeKeepoutAreaEditor( this, &zoneInfo );
                 }
                 else
@@ -904,7 +902,7 @@ void PCB_EDIT_FRAME::Edit_Zone_Params( wxDC* DC, ZONE_CONTAINER* aZone )
     NETINFO_ITEM* net = GetBoard()->FindNet( zoneInfo.m_NetcodeSelection );
 
     if( net )   // net == NULL should not occur
-        aZone->SetNetName( net->GetNetname() );
+        aZone->SetNet( net->GetNet() );
 
     // Combine zones if possible
     GetBoard()->OnAreaPolygonModified( &s_AuxiliaryList, aZone );

pcbnew/zones_by_polygon_fill_functions.cpp

@@ -103,7 +103,7 @@ int PCB_EDIT_FRAME::Fill_Zone( ZONE_CONTAINER* aZone )
     zoneInfo.m_NetcodeSelection = aZone->GetNet();
     SetZoneSettings( zoneInfo );
 
-    msg = aZone->GetNetName();
+    msg = aZone->GetNetname();
 
     if( msg.IsEmpty() )
         msg = wxT( "No net" );
@@ -150,7 +150,7 @@ int PCB_EDIT_FRAME::Fill_All_Zones( wxWindow * aActiveWindow, bool aVerbose )
         if( zoneContainer->GetIsKeepout() )
             continue;
 
-        msg.Printf( FORMAT_STRING, ii+1, areaCount, GetChars( zoneContainer->GetNetName() ) );
+        msg.Printf( FORMAT_STRING, ii + 1, areaCount, GetChars( zoneContainer->GetNetname() ) );
 
         if( progressDialog )
         {

pcbnew/zones_functions_for_undo_redo.cpp

@@ -67,7 +67,7 @@ bool ZONE_CONTAINER::IsSame( const ZONE_CONTAINER& aZoneToCompare )
     if( GetLayer() != aZoneToCompare.GetLayer() )
         return false;
 
-    if( m_Netname != aZoneToCompare.m_Netname )
+    if( GetNet() != aZoneToCompare.GetNet() )
         return false;
 
     if( GetPriority() != aZoneToCompare.GetPriority() )