A display equation wider than its column ran off the page. It now breaks
at top-level binary operators and relations (never inside a fraction,
radical, script or matrix), filling each line greedily; a term wider
than the line overflows instead of breaking inside.
- Break before the operator by default, or after it, or repeated on both
lines, as the document's m:brkBin says; m:brkBinSub picks how a minus
repeats.
- Continuation lines are indented by m:wrapIndent (one inch by default)
or set flush right with m:wrapRight.
- Manual breaks (m:brk on a run) start a new line; m:alnAt aligns it at
an operator of the first line.
- DOCX: m:mathPr in settings.xml and m:brk in math runs are read and
written back. Documents without them save as before.
- Inline equations, numbered equations and m:jc alignment are unchanged.
Tests: layout (a long sum wraps within the column with indented
continuation lines; after/repeat modes; manual breaks and alnAt; short
equations stay on one line; hostile break input) and DOCX round-trip.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
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