Round 3 Word bisection: co-factor probes around the PAGEREF fields

The mini opens with 3 byte-identical fields while the full shell fails even
with 3 (bisect_12) or 1 target (bisect_11), so the co-factor is outside the
TOC. Six new candidates keep fields and strip the remaining families or
probe the field mechanism:

- 13 drop scene-break paragraphs
- 14 drop all bookmarkStart/End (fields keep, targets vanish)
- 15 full shell with the mini's own 3-entry TOC spliced in verbatim
- 16 drop chapter title paragraphs (WAChapter)
- 17 rewrite PAGEREF instructions to PAGE (structure unchanged)
- 18 remove w:dirty (no auto field update on open)

tests/make_bisect_files.py

@@ -19,6 +19,7 @@ feature family:
 Open each in Word; whichever show the error dialog pinpoint the feature
 family at fault.
 """
+from copy import deepcopy
 import os
 import sys
 
@@ -47,6 +48,12 @@ NAMES = [
     'bisect_10_no_toc_section.docx',
     'bisect_11_same_target_fields.docx',
     'bisect_12_first3_toc.docx',
+    'bisect_13_no_scenes.docx',
+    'bisect_14_no_bookmarks.docx',
+    'bisect_15_mini_toc_in_full.docx',
+    'bisect_16_no_titles.docx',
+    'bisect_17_page_fields.docx',
+    'bisect_18_no_dirty.docx',
 ]
 
 
@@ -201,6 +208,83 @@ def make_first3_toc(doc):
                 p.remove(r)
 
 
+def make_no_scenes(doc):
+    """Drop the scene-break paragraphs (keep fields)."""
+    for p in list(doc.element.body.iter(qn('w:p'))):
+        txt = ''.join((t.text or '') for t in p.findall('.//' + qn('w:t')))
+        if '>>>' in txt:
+            p.getparent().remove(p)
+
+
+def make_no_bookmarks(doc):
+    """Remove every bookmarkStart/bookmarkEnd (fields stay, targets vanish)."""
+    for tag in ('w:bookmarkStart', 'w:bookmarkEnd'):
+        for b in list(doc.element.body.iter(qn(tag))):
+            b.getparent().remove(b)
+
+
+def make_mini_toc_in_full(doc):
+    """Full shell WITHOUT the TOC section, but with the mini book's own
+    3-entry TOC (heading + entries + fields) spliced in verbatim."""
+    make_no_toc_section(doc)
+    mini = Document(os.path.join(HERE, 'word_test_output.docx'))
+    paras = [c for c in mini.element.body if c.tag == qn('w:p')]
+    start = None
+    for i, p in enumerate(paras):
+        txt = ''.join((t.text or '') for t in p.findall('.//' + qn('w:t')))
+        if txt.strip() == 'Table of Contents':
+            start = i
+            break
+    end = len(paras)
+    for i in range(start + 1, len(paras)):
+        ppr = paras[i].find(qn('w:pPr'))
+        if ppr is not None and ppr.find(qn('w:sectPr')) is not None:
+            end = i
+            break
+    # anchor: first WAChapter paragraph (chapter 1 title) of the full shell
+    body = doc.element.body
+    anchor = None
+    for p in body.iter(qn('w:p')):
+        ppr = p.find(qn('w:pPr'))
+        if ppr is None:
+            continue
+        st = ppr.find(qn('w:pStyle'))
+        if st is not None and st.get(qn('w:val')) == 'WAChapter':
+            anchor = p
+            break
+    for pi in range(start, end):
+        body.insert(list(body).index(anchor), deepcopy(paras[pi]))
+
+
+def make_no_titles(doc):
+    """Drop the chapter title paragraphs (WAChapter) incl. their bookmarks."""
+    for p in list(doc.element.body.iter(qn('w:p'))):
+        ppr = p.find(qn('w:pPr'))
+        if ppr is None:
+            continue
+        st = ppr.find(qn('w:pStyle'))
+        if st is not None and st.get(qn('w:val')) == 'WAChapter':
+            p.getparent().remove(p)
+
+
+def make_page_fields(doc):
+    """Replace every PAGEREF instruction with PAGE (structure kept)."""
+    for it in doc.element.body.iter(qn('w:instrText')):
+        if (it.text or '').strip().startswith('PAGEREF'):
+            it.text = ' PAGE '
+
+
+def make_no_dirty(doc):
+    """Remove w:dirty from field runs (no auto field update on open)."""
+    for fc in doc.element.body.iter(qn('w:fldChar')):
+        r = fc.getparent()
+        rpr = r.find(qn('w:rPr'))
+        if rpr is not None:
+            d = rpr.find(qn('w:dirty'))
+            if d is not None:
+                rpr.remove(d)
+
+
 MAKERS = [
     make_no_running,
     make_no_oddpage,
@@ -214,6 +298,12 @@ MAKERS = [
     make_no_toc_section,
     make_same_target_fields,
     make_first3_toc,
+    make_no_scenes,
+    make_no_bookmarks,
+    make_mini_toc_in_full,
+    make_no_titles,
+    make_page_fields,
+    make_no_dirty,
 ]