pcbnew: fix slowly module change at ratsnest invisible

pcbnew/modules.cpp

@@ -325,6 +325,7 @@ bool WinEDA_PcbFrame::Delete_Module( MODULE* module,
     module->SetState( DELETED, ON );
     SaveCopyInUndoList( module, UR_DELETED );
 
+    if( DC && GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
         Compile_Ratsnest( DC, true );
 
     // Redraw the full screen to ensure perfect display of board and ratsnest.
@@ -393,6 +394,7 @@ void WinEDA_PcbFrame::Change_Side_Module( MODULE* Module, wxDC* DC )
         if( DC )
         {
             Module->Draw( DrawPanel, DC, GR_OR );
+            if( GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
                 Compile_Ratsnest( DC, true );
         }
     }

pcbnew/xchgmod.cpp

@@ -244,6 +244,7 @@ void DIALOG_EXCHANGE_MODULE::Change_Module()
 
     if( Change_1_Module( m_CurrentModule, newmodulename, &pickList, true ) )
     {
+        if( m_Parent->GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
             m_Parent->Compile_Ratsnest( NULL, true );
         m_Parent->DrawPanel->Refresh();
     }
@@ -325,6 +326,7 @@ void DIALOG_EXCHANGE_MODULE::Change_ModuleId( bool aUseValue )
 
     if( change )
     {
+        if( m_Parent->GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
             m_Parent->Compile_Ratsnest( NULL, true );
         m_Parent->DrawPanel->Refresh();
     }
@@ -374,6 +376,7 @@ void DIALOG_EXCHANGE_MODULE::Change_ModuleAll()
 
     if( change )
     {
+        if( m_Parent->GetBoard()->IsElementVisible( RATSNEST_VISIBLE ) )
             m_Parent->Compile_Ratsnest( NULL, true );
         m_Parent->DrawPanel->Refresh();
     }