tdf#141966 writerfilter CN: set minimum threshold

I have found that in both DOC and DOCX numbering bugs,
many can be fixed simply by not assigning Chapter Numbering
at all. So set a minimum threshold to deter useless assignments.

[Note that a LO round-trip should save as numId 1,
and thus a single entry would make it qualify.
For Word-authored documents, this threshold means
at least 3 Heading X styles (which matches LO default workflow)
or 6 out of 9 Levels defined for non-heading styles.]

Change-Id: Ic3d1c800a703721e7ab5302e274ee1eeda496ac0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118543
Tested-by: Jenkins
Reviewed-by: Justin Luth <justin_luth@sil.org>

0 files changed, 0 insertions, 0 deletions