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 on_backend_state_changed(self, sender, backend_id):
        """
        Signal callback executed when a backend is enabled/disabled.

        @param sender: not used, only here to let this function be used as a
                       callback
        @param backend_id: the id of the backend to add
        """
        if backend_id in self.backendid_to_iter:
            b_iter = self.backendid_to_iter[backend_id]
            b_path = self.liststore.get_path(b_iter)
            backend = self.req.get_backend(backend_id)
            backend_name = backend.get_human_name()
            if backend.is_enabled():
                text = backend_name
            else:
                # FIXME This snippet is on more than 2 places!!!
                # FIXME create a function which takes a widget and
                # flag and returns color as #RRGGBB
                style_context = self.get_style_context()
                color = style_context.get_color(Gtk.StateFlags.INSENSITIVE)
                color = rgba_to_hex(color)
                text = f"<span color='{color}'>{backend_name}</span>"
            self.liststore[b_path][self.COLUMN_TEXT] = text

            # Also refresh the tags
            new_tags = self._get_markup_for_tags(backend.get_attached_tags())
            self.liststore[b_path][self.COLUMN_TAGS] = new_tags