---
id: TASK-005
title: 'Canvas measures tabs/CJK/emoji as rune count, not display cells'
status: "\U0001F7E6 Backlog"
assignee: []
created_date: '2026-06-28 18:38'
updated_date: '2026-06-30 00:22'
labels:
  - bug
  - release-2
dependencies: []
priority: low
ordinal: 5000
---

## Description

<!-- SECTION:DESCRIPTION:BEGIN -->
wrapLine and visualColOf measure in runes, not terminal display width. A \t (KeyTab) or wide rune (CJK/emoji) wraps and positions the cursor cell by the wrong column. Pre-existing approach, now load-bearing for the canvas layout. Will surface on tab-indented code blocks or CJK text. Use a display-width (e.g. go-runewidth / uniseg) measure for wrapping + cursor placement.
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria
<!-- AC:BEGIN -->
- [ ] #1 wrapping and cursor placement use display-cell width
<!-- AC:END -->