https://bugs.documentfoundation.org/show_bug.cgi?id=166510

            Bug ID: 166510
           Summary: FILEOPEN DOCX: paragraph before section page break has
                    wrong bottom spacing
           Product: LibreOffice
           Version: 25.2.3.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: bibisected, bisected, filter:doc, filter:docx
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: jl...@mail.com
                CC: jl...@mail.com
            Blocks: 107830, 112682

Created attachment 200718
  --> https://bugs.documentfoundation.org/attachment.cgi?id=200718&action=edit
forum-mso-en-14884.docx: a simple example document

My 25.8 commit 9a8eb2dc17435d290f482070dd5f20f538b5b68b (backported to 25.2.3)
    tdf#165047 sw mso-compat layout: always consolidate top margin
correctly reduces the top margin of the paragraph-after-a-page-break by the
previous paragraph's bottom spacing.

IIUC, we never create a CR marker for an empty sectPr paragraph, and thus LO
throws away the bottom-spacing of the sectPr paragraph - although this has the
setting that informs the paragraph-after-the-section-page-break how much it
needs to consolidate from its top spacing.

Since the bottom spacing of the paragraph-before-an-empty-sectPr will end up
being irrelevant, we should just be able to replace it with the sectPr's bottom
spacing at import time.

Steps to reproduce
1.) open the 2-page forum-mso-en-14884.docx

After the page break, there should be a 12pt (0.42cm) gap between the header
and "Chapitre 1" (since the Heading 1's 12pt before-spacing should be
consolidated with Heading 1's 0pt after-spacing instead of Normal's 8pt
after-spacing).

<w:p>
  <w:pPr>
    <w:pStyle w:val="Titre1"/> ...
    <w:sectPr/>
  </w:pPr>

<w:style w:type="paragraph" w:styleId="Titre1">
  <w:name w:val="heading 1"/>
  <w:pPr>
    <w:spacing w:before="240" w:after="0"/>
  </w:pPr>

There are many more examples:
-forum-mso-de-88983.docx: notable - it should consolidate by 18pt instead of
8pt
-forum-mso-de-102317.docx: consolidate 30pt with 24pt instead of 6pt
-forum-mso-de-103594.docx: w:spacing w:after="0" w:line="276"
w:lineRule="auto"/
-forum-mso-de-60094.docx: page 5
-forum-mso-de-63307.docx: page 7 
-forum-mso-de-67370.docx: page 2. Other pages with normal breaks were fixed...
-forum-mso-de-69658.docx: page 8
-forum-mso-de-74815.docx: page 6. not an empty sectPr
-forum-mso-en-13355.docx: page 2 - all "Normal" styles
-forum-mso-en-17432.docx: page 3
-forum-mso-en-2676.docx: page 2, 5
-forum-mso-en3-19156.docx: page 4 only

DOC EXAMPLES
-forum-mso-en-2256.doc: page 4 and 8
-ooo112024-1.doc: page 2
-ooo98045-2.doc: page 7, 8: consolidate 17pt with 0pt instead of 17pt.

Found by Collabora's mso-test


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=107830
[Bug 107830] [META] DOCX (OOXML) paragraph-related issues
https://bugs.documentfoundation.org/show_bug.cgi?id=112682
[Bug 112682] [META] DOC (binary) paragraph-related issues
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