[glom] Const correction

[Murray Cumming <murrayc src gnome org>]

commit c994e34f12b38e22619951cdc01efb78b4448ba7
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 11 23:16:44 2011 +0200

    Const correction

 glom/print_layout/canvas_print_layout.cc |    6 +++---
 glom/print_layout/canvas_print_layout.h  |    2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/glom/print_layout/canvas_print_layout.cc b/glom/print_layout/canvas_print_layout.cc
index 4c11882..6927b9d 100644
--- a/glom/print_layout/canvas_print_layout.cc
+++ b/glom/print_layout/canvas_print_layout.cc
@@ -942,7 +942,7 @@ void Canvas_PrintLayout::fill_with_data_portal(const Glib::RefPtr<CanvasLayoutIt
   }
 }
 
-void Canvas_PrintLayout::set_canvas_item_field_value(const Glib::RefPtr<Goocanvas::Item> canvas_item, const sharedptr<LayoutItem_Field> field, const Gnome::Gda::Value& value)
+void Canvas_PrintLayout::set_canvas_item_field_value(const Glib::RefPtr<Goocanvas::Item>& canvas_item, const sharedptr<const LayoutItem_Field>& field, const Gnome::Gda::Value& value)
 {
   if(!field)
     return;
@@ -968,8 +968,8 @@ void Canvas_PrintLayout::set_canvas_item_field_value(const Glib::RefPtr<Goocanva
 
     Glib::ustring text;
 
-    sharedptr<LayoutItem_WithFormatting> with_formatting = 
-      sharedptr<LayoutItem_WithFormatting>::cast_dynamic(field);
+    sharedptr<const LayoutItem_WithFormatting> with_formatting = 
+      sharedptr<const LayoutItem_WithFormatting>::cast_dynamic(field);
     if(with_formatting)
     {
       const FieldFormatting& formatting = with_formatting->get_formatting_used();
diff --git a/glom/print_layout/canvas_print_layout.h b/glom/print_layout/canvas_print_layout.h
index c3bb427..4abea0f 100644
--- a/glom/print_layout/canvas_print_layout.h
+++ b/glom/print_layout/canvas_print_layout.h
@@ -102,7 +102,7 @@ private:
   //These are not static, because they need access to the document:
   void fill_with_data(const Glib::RefPtr<Goocanvas::Group>& canvas_group, const FoundSet& found_set);
   void fill_with_data_portal(const Glib::RefPtr<CanvasLayoutItem>& canvas_item, const Gnome::Gda::Value& foreign_key_value);
-  static void set_canvas_item_field_value(const Glib::RefPtr<Goocanvas::Item> canvas_item, const sharedptr<LayoutItem_Field> field, const Gnome::Gda::Value& value);
+  static void set_canvas_item_field_value(const Glib::RefPtr<Goocanvas::Item>& canvas_item, const sharedptr<const LayoutItem_Field>& field, const Gnome::Gda::Value& value);
 
   static Glib::RefPtr<Goocanvas::Item> get_canvas_table_cell_child(const Glib::RefPtr<Goocanvas::Table>& table, int row, int col); //TODO: Add this to Goocanvas::Table.