Renaming a keyword cut the keywords below it at the byte length of the
name as typed. Names match whatever their case, but some letters change
length with it (ẞ is three bytes, ß two): `STRAẞE` → `Road` turned
`straße|nord` into `Roadnord`, and a cut inside a letter would panic.
The levels below are now kept whole.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Nathaniel LedfordandClaude Opus 5.5
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