Text inside a Word text box is not indexed

Start with api/core/rag/extractor/word_extractor.py, especially WordExtractor.parse_docx, and review the fix with tests already open in issue #42334. Run the relevant extractor tests and verify that text from Word text boxes appears once in reading order between surrounding paragraphs.

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Dify version

main (6a0039812d)

Cloud or Self Hosted

Self Hosted (Source)

Steps to reproduce

Upload a .docx to a knowledge base in which some text sits in a text box — a callout, a pull quote, a sidebar, a label drawn over a diagram. Word writes a text box as a drawing inside a run, with its own paragraphs under w:txbxContent.

api/core/rag/extractor/word_extractor.py (WordExtractor.parse_docx) walks each paragraph's direct children for w:r and w:hyperlink, and a run contributes Run.text. python-docx builds Run.text from the run's direct w:t children only, so the paragraphs inside w:txbxContent are never visited.

A document whose first paragraph anchors a text box reading CALLOUT, followed by a paragraph AFTER:

>>> WordExtractor("textbox.docx", tenant_id, user_id).extract()[0].page_content
'PARAGRAPH TEXT\nAFTER'

The same result for both shapes Word writes: a bare wps:txbx, and the mc:AlternateContent form (a wps:txbx under mc:Choice plus a VML v:textbox under mc:Fallback), which is what Word itself saves.

✔️ Expected Behavior

The text box is part of the page, so its text is part of the document, in reading order and once:

'PARAGRAPH TEXT\nCALLOUT\nAFTER'

❌ Actual Behavior

The text box is dropped. Nothing fails and nothing is logged; the callout, quote or label is simply absent from the indexed content, so a question whose answer is in it retrieves nothing.

A fix with tests is open in #42334.