Add wxDataViewCtrl::ExpandAncestors() and call it from both EnsureVisible() and Select()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57511 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dataview.h

@@ -887,6 +887,13 @@ public:
     */
     virtual void Expand(const wxDataViewItem& item);
 
+    /**
+       Expands all ancestors of the @a item. This method also
+       ensures that the item itself as well as all ancestor
+       items have been read from the model by the control.
+    */
+    virtual void ExpandAncestors( const wxDataViewItem & item );
+    
     /**
         Returns pointer to the column. @a pos refers to the position in the
         control which may change after reordering columns by the user.