Refresh net annotations on tracks, pads, etc. when name changes.

Fixes https://gitlab.com/kicad/code/kicad/issues/5466

pcbnew/dialogs/dialog_select_net_from_list.cpp

@@ -930,6 +930,12 @@ void DIALOG_SELECT_NET_FROM_LIST::onRenameNet( wxCommandEvent& aEvent )
 
         buildNetsList();
         m_netsList->Refresh();
+
+        // Currently only tracks and pads have netname annotations and need to be redrawn,
+        // but zones are likely to follow.  Since we don't have a way to ask what is current,
+        // just refresh all items.
+        m_frame->GetCanvas()->GetView()->UpdateAllItems( KIGFX::REPAINT );
+        m_frame->GetCanvas()->Refresh();
     }
 }