solved pcbnew: minor bug when only one copper layer selected: zone properties layer list displayed component layer instead of copper layer

pcbnew/dialog_zones_by_polygon.cpp

@@ -257,7 +257,7 @@ void WinEDA_ZoneFrame::OnInitDialog( wxInitDialogEvent& event )
     BOARD*  board = m_Parent->m_Pcb;
 
     SetFont( *g_DialogFont );
-    
+
     SetFocus();     // Required under wxGTK if we want to demiss the dialog with the ESC key
 
     wxString title = _( "Zone clearance value:" ) + ReturnUnitSymbol( g_UnitMetric );
@@ -295,7 +295,7 @@ void WinEDA_ZoneFrame::OnInitDialog( wxInitDialogEvent& event )
     }
     if( grid_routing == 0 )    // No Grid: fill with polygons
          selection = 4;
- 
+
     m_GridCtrl->SetSelection( selection );
 
     if( m_Zone_Container )
@@ -353,13 +353,14 @@ void WinEDA_ZoneFrame::OnInitDialog( wxInitDialogEvent& event )
         break;
     }
 
+    /* build copper layers list */
     int layer_cnt = board->GetCopperLayerCount();
     for( int ii = 0; ii < board->GetCopperLayerCount(); ii++ )
     {
         wxString msg;
         int      layer_number = COPPER_LAYER_N;
 
-        if( layer_cnt == 0 || ii < layer_cnt - 1 )
+        if( layer_cnt <= 1 || ii < layer_cnt - 1 )
             layer_number = ii;
         else if( ii == layer_cnt - 1 )
             layer_number = LAYER_CMP_N;

pcbnew/zones_by_polygon.cpp

@@ -898,6 +898,7 @@ int WinEDA_PcbFrame::Fill_Zone( wxDC* DC, ZONE_CONTAINER* zone_container, bool v
     }
     else
     {
+        zone_container->m_FilledPolysList.clear();
         zone_container->m_GridFillValue = g_GridRoutingSize;
         error_level = zone_container->Fill_Zone( this, DC, verbose );
     }
@@ -935,6 +936,7 @@ int WinEDA_PcbFrame::Fill_All_Zones( wxDC* DC, bool verbose )
     for( int ii = 0; ii < m_Pcb->GetAreaCount(); ii++ )
     {
         zone_container = m_Pcb->GetArea( ii );
+        zone_container->m_FilledPolysList.clear();
         error_level    = Fill_Zone( NULL, zone_container, verbose );
         if( error_level && !verbose )
             break;