Retrieves the element stack from the internal state of the parser.
The returned `GPtrArray` is an array of strings where the last item is the currently open tag (as would be returned by get_element) and the previous item is its immediate parent.
This function is intended to be used in the start_element and end_element handlers where get_element would merely return the name of the element that is being processed.
this |
a `GtkBuildableParseContext` |
the element stack, which must not be modified |