Text measured `ceil(sum of steps) + 1`: no kerning, float advances, the last glyph priced by its step, and no outline or shadow lead.
In 1.12.1 the kernel (`0x5c6940`) seeds a line with the outline lead plus the shadow (`0x5c69c0`, `0x5c69a4`), steps each glyph by `ceil(floor(adv) + 1 + min(kern, 0))` on FreeType's 26.6 advances (`0x5ca2d0`, `0x5d1298`), prices the line's last glyph by its ink (`0x5c6b70`, `0x5cb080`) and carries the previous glyph across a break (`0x5c6aa0`). The draw rows use the same law, shadow-seeded, wrapping at `ceil(width)` (`0x5c7470`, `0x5cddb1`).
The measure, the wrap, the justify and the EditBox now follow it, reading the face's own metrics, kerning and composite build (`0x7d40e6`).
Tests pin widths computed outside the code base from FRIZQT and ARIALN at 12–34 px, with and without outline and shadow.
Fixes#427🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
