Reference to sibling in choice filter not correctly expanded in select from repeat inside that same repeat

[lognaturel]

Related to #504

Software and hardware versions

pyxform v1.3.3

Problem description

Reference to sibling in choice filter not correctly expanded in select from repeat inside that same repeat.

Steps to reproduce the problem

Note that the expansion happens as expected with a select not from repeat.

def test_reference_to_same_repeat_in_choice_filter__produces_current_expression(self):
    xlsform_md = """
    | survey  |                      |         |         |                         |
    |         | type                 | name    | label   | choice_filter           |
    |         | begin repeat         | repeat  | Repeat  |                         |
    |         | text                 | sibling | Sibling |                         |        
    |         | select_one ${sibling}| dynamic | Dynamic | name = ${sibling}       |
    |         | select_one yes_no    | inner   | Yes?    | name = ${sibling}       |
    |         | end repeat           | repeat  |         |                         |
    | choices |                      |         |         |                         |
    |         | list_name            | name    | label   |                         |
    |         | yes_no               | yes     | Yes     |                         |
    |         | yes_no               | no      | No      |                         |
    """
    self.assertPyxformXform(
        name="data",
        debug=True,
        md=xlsform_md,
        xml__contains=[
            '<itemset nodeset="../../repeat[name =  current()/../sibling ]">',
        ],
    )

[lindsay-stevens]

For future reference, I checked this case with the changes in #777 but it's still broken - the choice filter reference comes out in the XForm as name = ./sibling. It seems like there is a larger issue with the interaction between survey.py code and question.py code, which together handle the application of current() to relative paths.