The uniform LibreOffice definitions duplicated the dropdown formats plus
default nesting. The gallery now ships patterns the depth cycle cannot
produce: the outline chains Outline I.A.1 / A.I.1, the kind-mixing
Numbering with Bullets and Checklist, and the Diamond Bullets ladder,
all on the plain 1.27cm step. STYLE_SHEET_VERSION 12 swaps stored
built-ins while user styles survive.