[taran-dev4u]

ODT table-of-content containers (text:table-of-content and related index elements) were matching the unhandled element branch in _add_odf_child(), dropping the index title and entry paragraphs from the converted document.

This change visits text:index-body children for table-of-content and other index containers, routing entries to ContentLayer.BODY in source order (or ContentLayer.INVISIBLE when text:display="none" is set).

Issue resolved by this Pull Request:
Resolves #4749

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

Review evidence:

• Before: with an ODT containing a generated table of contents, the index title and all entry paragraphs were dropped, exporting only surrounding body paragraphs.
• After: index title and entries are extracted in reading order as text items in ContentLayer.BODY.
• Tests: added unit tests in tests/test_backend_opendocument.py covering table-of-contents extraction, hidden TOCs, and illustration/table index containers. All 64 tests in test_backend_opendocument.py pass.
• Checks: ruff check and ruff format --check pass on changed files.

[github-actions]

✅ DCO Check Passed

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🟢 Enforce conventional commit

Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[github-actions]

AI triage (advisory)

Checked commit a7ed5a1660. The analysis read the diff only. It did not run code from this pull request.

The PR adds handling for ODT index containers (table of contents, illustration, table and other indexes) in _add_odf_child(). It keeps the index title and entry text in source order. Hidden indexes go to the invisible layer.

Topic labels added: bug, odf.

CI safety: no concern found. A maintainer must still approve CI.

Possible duplicates

PR	State	Signal	Assessment
#4750	open	also references issue #4749; changes the same code	duplicate: Both PRs fix #4749 by routing the same set of ODT index container tags into the existing child-visiting code in _add_odf_child(). They edit the same lines, so only one can be merged.

_{The ai:* labels are advisory. They do not approve CI and they do not add tests:full. A new push runs this check again.}

[taran-dev4u]

Closing in favor of #4750.