gtkmm: New API in gtkmm 2.8

gtkmm 4.6.0

New API in gtkmm 2.8

Member Gtk::IconView::get_cursor (TreeModel::Path& path, CellRenderer*& cell) const
Member Gtk::IconView::get_cursor (TreeModel::Path& path) const
Member Gtk::IconView::get_cursor (CellRenderer*& cell) const
Member Gtk::TreeView::get_path_at_pos (int x, int y, TreeModel::Path& path, TreeViewColumn*& column, int& cell_x, int& cell_y) const
Member Gtk::TreeView::unset_model ()