def test_view_of_view(matrix_type, subset_func, subset_func2):
    adata = gen_adata((30, 15), X_type=matrix_type)
    adata.raw = adata
    if subset_func is single_subset:
        pytest.xfail("Other subset generating functions have trouble with this")
    var_s1 = subset_func(adata.var_names, min_size=4)
    var_view1 = adata[:, var_s1]
    var_s2 = subset_func2(var_view1.var_names)
    var_view2 = var_view1[:, var_s2]
    assert var_view2._adata_ref is adata
    obs_s1 = subset_func(adata.obs_names, min_size=4)
    obs_view1 = adata[obs_s1, :]
    obs_s2 = subset_func2(obs_view1.obs_names)
    assert adata[obs_s1, :][:, var_s1][obs_s2, :]._adata_ref is adata

    view_of_actual_copy = adata[:, var_s1].copy()[obs_s1, :].copy()[:, var_s2].copy()

    view_of_view_copy = adata[:, var_s1][obs_s1, :][:, var_s2].copy()

    assert_equal(view_of_actual_copy, view_of_view_copy, exact=True)
def cell_edited_callback(self, text_cell, path, new_text):
        """If a backend name is changed, it saves the changes in the Backend

        @param text_cell: not used. The Gtk.CellRendererText that emitted the
                          signal. Only here because it's passed by the signal
        @param path: the Gtk.TreePath of the edited cell
        @param new_text: the new name of the backend
        """
        # we strip everything not permitted in backend names
        new_text = ''.join(c for c in new_text if (c.isalnum() or c in [" ", "-", "_"]))
        selected_iter = self.liststore.get_iter(path)
        # update the backend name
        backend_id = self.liststore.get_value(selected_iter,
                                              self.COLUMN_BACKEND_ID)
        backend = self.dialog.get_requester().get_backend(backend_id)
        if backend:
            backend.set_human_name(new_text)
            # update the text in the liststore
            self.liststore.set(selected_iter, self.COLUMN_TEXT, new_text)