Accept a ConstPtr in ToolTips::setFocusObject

apps/openmw/mwgui/tooltips.cpp

@@ -317,7 +317,7 @@ namespace MWGui
         }
     }
 
-    void ToolTips::setFocusObject(const MWWorld::Ptr& focus)
+    void ToolTips::setFocusObject(const MWWorld::ConstPtr& focus)
     {
         mFocusObject = focus;
     }

apps/openmw/mwgui/tooltips.hpp

@@ -58,7 +58,7 @@ namespace MWGui
 
         void setDelay(float delay);
 
-        void setFocusObject(const MWWorld::Ptr& focus);
+        void setFocusObject(const MWWorld::ConstPtr& focus);
         void setFocusObjectScreenCoords(float min_x, float min_y, float max_x, float max_y);
         ///< set the screen-space position of the tooltip for focused object
 
@@ -93,7 +93,7 @@ namespace MWGui
     private:
         MyGUI::Widget* mDynamicToolTipBox;
 
-        MWWorld::Ptr mFocusObject;
+        MWWorld::ConstPtr mFocusObject;
 
         MyGUI::IntSize getToolTipViaPtr (int count, bool image=true);
         ///< @return requested tooltip size