wxDataViewCtrl patch from Hartwig

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48664 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dataview.h

@@ -407,7 +407,7 @@ public:
     virtual bool IsSortOrderAscending() const = 0;
 
     const wxBitmap &GetBitmap() const       { return m_bitmap; }
-    unsigned int GetModelColumn() const     { return m_model_column; }
+    unsigned int GetModelColumn() const     { return static_cast<unsigned int>(m_model_column); }
 
     wxDataViewCtrl *GetOwner()              { return m_owner; }
     wxDataViewRenderer* GetRenderer()       { return m_renderer; }