This commit fixes the display of subfields in the export dialog. Currently,
after a search, the results are filtered to only show the matching results.
But when unfolding an expandable field, the results are not shown below. It
is only set visible after the search has been modified to rerender the list
completely.
Now, with this commit, the list is updated as the field is unfolded.
A test has been added to verify that the element is loaded and displayed as
expected.
opw-3316900, opw-3302785
closesodoo/odoo#123707
X-original-commit: bc18cd55f97ec6119717455217372bac161c9b07
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>