Journal - update favourite icon when clicked

When there is only one journal entry or Documents file, and the favourite icon is clicked, it is not updated and stays in the previous state, even though the entry is now favourite.

The cause is unknown.

Use a hack to force a refresh when the icon is clicked.

Fixes https://bugs.sugarlabs.org/ticket/4944

Part of #788

Tested-by: Rahul Bothra <f2016015@pilani.bits-pilani.ac.in>  # Ubuntu 16.04
Tested-by: James Cameron <quozl@laptop.org>  # Ubuntu 18.04

src/jarabe/journal/listview.py

@@ -415,6 +415,11 @@ def _favorite_clicked_cb(self, cell, path):
         self.tree_view.queue_draw_area(cell_rect.x, cell_rect.y,
                                        cell_rect.width, cell_rect.height)
 
+        # HACK for https://bugs.sugarlabs.org/ticket/4944
+        # Icon does not update automatically if there is only one journal entry
+        if len(self._model.get_all_ids()) == 1:
+            self._do_refresh()
+
     def __select_set_data_cb(self, column, cell, tree_model, tree_iter,
                              data):
         uid = tree_model[tree_iter][ListModel.COLUMN_UID]