---
id: TASK-003
title: Wrapped-line vertical move can skip a row at a trailing-space boundary
status: "\U0001F3C1 Done"
assignee: []
created_date: '2026-06-28 18:38'
updated_date: '2026-06-29 01:18'
labels:
  - bug
dependencies: []
priority: low
ordinal: 3000
---

## Description

<!-- SECTION:DESCRIPTION:BEGIN -->
MoveUp/MoveDown via applyGoal: when goalCol clamps to min(goalCol, target.runes) and the target is a non-last wrap segment ending in a trailing space (e.g. 'aaaa ' runes=5), landing at col=start+5 == start of the NEXT segment, so cursorVIndex maps to the row after the intended one — arrow visibly skips a row. No buffer/state corruption; logical position is sensible. Fix: clamp non-last segments to runes-1 at a soft-wrap boundary, or special-case the trailing-space column. Add a regression test pinning intended behavior.
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria
<!-- AC:BEGIN -->
- [ ] #1 vertical move lands on the visually-adjacent row at wrap boundaries
- [ ] #2 regression test added
<!-- AC:END -->