Keep hyphen runs and word-initial hyphens together in NominalWordWrap [patch]

[matt-edmondson]

Fixes #156
Fixes #159

What changes

ChunkWord ended a chunk after every visible hyphen. Both triage comments say to fix these two issues together, so this PR changes one rule. A visible hyphen is now a break opportunity only when both of these hold:

• it is the last hyphen of its run (NominalWordWrap breaks between the two hyphens of a "--" dash: "late--too" wraps to "late-" / "-too" #159), so -- is never split into late- / -too
• some non-hyphen character comes before it in the same word (NominalWordWrap breaks after a word-initial hyphen, splitting "-5" and "--force" across lines #156), so -5 and --force are never split after the dash

Input	Width	Before	After
It was late--too late to call	12	It was late- / -too late to / call	It was / late--too / late to call
ab -5	4	ab - / 5	ab / -5
Use the --force flag	10	Use the -- / force flag	Use the / --force / flag

well-known and foo-bar-baz still break after their hyphens. The soft-hyphen behaviour from #135 and #151 is unchanged, and its existing tests still pass.

A hyphen can now stay inside an unbroken chunk, so one guard was added for that case. When a soft hyphen follows a leading --, a break there no longer adds a third hyphen.

Tests

• New tests cover the repros from both issues, a break after the last hyphen of a run, -5-6 (a hyphen after a leading one is still a break), and the soft-hyphen guard.
• With the fix reverted, the two repro tests fail. With the fix, the full suite passes (181 tests). The Release build passes on every target framework.

🤖 Generated with Claude Code

https://claude.ai/code/session_01P2fpLkFHYU6nd3JVKufVtK

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[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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