difference of the get_dest_row_at_pos and get_path_at_pos in treeview class

[Liangxu Wang <wlx mygis org>]

Hi,
	Sorry if I misunderstanding of these two function in treeview class,
from my understanding, the two function should get the path result, but
if I set the headers visible(this is the default behavior), the two
function return different path. So is this a bug or feature?
	Thanks.

code example:
++++++++++++++++++
		Gtk::TreeModel::Path path;
		Gtk::TreeViewColumn* c=0;
		int cellx,celly;
		get_path_at_pos(x,y,path,c,cellx,celly);
		Gtk::TreeModel::iterator iter = refTreeModel->get_iter(path);
		std::cout<<"x,y:"<<x<<","<<y<<std::endl;
		if (iter)
		{
			std::cout<<(*iter)[columns.name]<<std::endl;
		}
		Gtk::TreeViewDropPosition 	 pos;
		get_dest_row_at_pos(x,y,path,pos);
		iter = refTreeModel->get_iter(path);
		std::cout<<"x,y:"<<x<<","<<y<<std::endl;
		if (iter)
		{
			std::cout<<(*iter)[columns.name]<<std::endl;
		}

Sincerely yours,
Liangxu Wang