Fixes: lp:1635723 (pcbnew: allows sometimes to draw tracks in non copper layers in Gal Mode)

https://bugs.launchpad.net/kicad/+bug/1635723

pcbnew/onleftclick.cpp

@@ -280,7 +280,7 @@ void PCB_EDIT_FRAME::OnLeftClick( wxDC* aDC, const wxPoint& aPosition )
     case ID_TRACK_BUTT:
         if( !IsCopperLayer( GetActiveLayer() ) )
         {
-            DisplayError( this, _( "Tracks on Copper layers only " ) );
+            DisplayError( this, _( "Tracks on Copper layers only" ) );
             break;
         }
 

pcbnew/router/router_tool.cpp

@@ -486,15 +486,20 @@ bool ROUTER_TOOL::onViaCommand( TOOL_EVENT& aEvent, VIATYPE_T aType )
 bool ROUTER_TOOL::prepareInteractive()
 {
     int routingLayer = getStartLayer( m_startItem );
+
+    if( !IsCopperLayer( routingLayer ) )
+    {
+        DisplayError( m_frame, _( "Tracks on Copper layers only" ) );
+        return false;
+    }
+
     m_frame->SetActiveLayer( ToLAYER_ID( routingLayer ) );
 
     // fixme: switch on invisible layer
 
     // for some reason I don't understand, GetNetclass() may return null sometimes...
-    if( m_startItem &&
-        m_startItem->Net() >= 0 &&
-        m_startItem->Parent() &&
-        m_startItem->Parent()->GetNetClass() )
+    if( m_startItem && m_startItem->Net() >= 0 &&
+        m_startItem->Parent() && m_startItem->Parent()->GetNetClass() )
     {
         highlightNet( true, m_startItem->Net() );
         // Update track width and via size shown in main toolbar comboboxes