[DemchaAV]

Why

The DOCX export writes every section of a multi-section document with its pages numbered from 1
(w:pgNumType w:start="1"), as the page numbers them. It states different even and odd pages for
the whole document (w:evenAndOddHeaders) once any section has a page zone on even or odd pages
only. With both, Word starts every section on an odd page, so it adds a blank page before a section
whose section before it runs to an odd number of pages. The report said nothing.

Measured in Word 16 and LibreOffice on Windows, with a zone on even pages in one section:

Sections' pages	Page	Word	LibreOffice
1, 1, 1	3	5 (a blank before 2 and 3)	3
2, 1, 1	4	5 (a blank before 3)	4
1, 2, 1	4	5 (a blank before 2)	4
1, 3, 2	6	8 (a blank before 2 and 3)	6
2, 3	5	5	5

Word files a section's even and odd pages by the section's own numbers: the even-page footer
stood on each section's second page, where the page draws it, in both editors.

Edited by hand in the 1, 3 document, Word adds no page in three variants, but each one changes what it shows:

Hand edit	Blank page	What changes
even and odd pages not stated	none	the even-page footer is not shown at all
the second section's numbers not restarted	none	the footer stands on the section's first and third pages, not its second
the numbers restarted at 2	none	the footer stands on the section's first and third pages, not its second

So the page cannot be avoided without changing what the page numbers read or where the zones stand.

What changed

• DocxSemanticBackend.reportTheBlankPageBefore, called for each section after the first
  where the document states different even and odd pages:
  • an APPROXIMATED note, subject page zone, path section N: "Word adds a blank page
    before this section: the section before it runs to one page, and Word starts every section
    on an odd page where the document states different even and odd pages…";
  • read from the page count the layout gives the section before it;
  • where that section has no layout, the note says "where the section before it runs to an
    odd number of pages";
  • the DOCX is written as before.
• Docs:
  • the DOCX recipe's "Several sections in one document";
  • the capability matrix's multi-section row;
  • CHANGELOG v2.5.0.

Verification

• DocxBlankPageBeforeSectionTest (new, 5 tests):
  • sections of 1, 1, 1 pages: notes before sections 2 and 3, worded as above;
  • 1, 3, 2: before sections 2 and 3, the second "runs to 3 pages";
  • 2, 1, 1: before section 3 only;
  • 1, 2, 1: before section 2 only;
  • 2, 2: none;
  • no even and odd pages stated: none;
  • a section before with no layout: the "where" note.
• 5 sabotages, all caught:
  • not named;
  • named without even and odd pages too;
  • parity inverted;
  • an uncounted section taken as even;
  • the first section read instead of the one before.
• Corpus: 62/62 DOCX byte-identical; report notes 1246 → 1246.
• ./mvnw -B -ntp clean verify: BUILD SUCCESS (core 821, render-docx 1780, examples 93, qa 1820); the knowledge pack's --check passes.

Lane: render-docx (semantic backend). A report note only; no output change.