Input line-wrapping and constrained measurement

Overview

Changes to Input widget line-wrapping defaults and Flex constrained measurement behavior. Multiline inputs now line-wrap by default; no per-widget :line-wrap? true opt-in needed. Single-line inputs remain unwrapped. Flex layout allocates remaining axis space proportionally by flex weight, with fixed children measured first.

Key changes (commit b3f0f8a9, 2026-07)

• Multiline default: Input widgets with :multiline? true now line-wrap by default. The :line-wrap? option still exists but defaults to true for multiline inputs.
• Constrained measurement: Flex allocates remaining axis space proportionally by flex weight. Fixed children (non-flex) are measured first; remaining space is distributed among flex children.
• Wrapped caret auto-scroll: Caret positioning uses visual-row mapping; scroll-on-type tracks visual rows during wrapping.
• ListView auto-scroll viewport: Uses constrained measurement for fill-width wrapping children. Viewport height corrects on width changes (e.g., window resize).
• Chat message entries: Use :max-lines math.huge so wrapped content is not line-capped.

Affected modules

• assets/lua/input.fnl — Input widget, multiline and line-wrap defaults
• assets/lua/flex.fnl — Flex layout, constrained measurement
• assets/lua/list-view.fnl — ListView auto-scroll viewport
• assets/lua/caret-state.fnl — Visual-row caret positioning

See also

• Layout Widget Engine