A multi-line EditBox kept its authored height, so a scroll frame around a long mail body or ticket had no range. A box made in Lua with no template never placed its text, so it drew nothing.
In 1.12.1, the flush's relayout sets a multi-line box's height to its insets plus its wrapped text height, or one line when empty (`0x77d4d0` at `0x77d8ad`). Every resize, including the first layout, re-seats the text at the top-left inset (`0x77a8d0` → `0x77b8c0`). `SetTextInsets`, `GetTextInsets`, `SetMultiLine` and a font change re-seat it too.
benilla now does the same. A focused multi-line box's caret and text are clipped only by a scroll frame, as the reference clips neither.
Tests cover growth and shrink, the stock mail and ticket scroll ranges, each re-seat trigger, a Lua box's first layout, and the caret in an empty box and after a trailing newline.
Fixes#722Fixes#726🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
