---
id: TASK-006
title: Undo / redo
status: "\U0001F7E2 In progress"
assignee: []
created_date: '2026-06-29 16:26'
updated_date: '2026-06-29 17:49'
labels:
  - feature
  - release-1
dependencies: []
priority: high
ordinal: 6000
---

## Description

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Release 1. The biggest gap and a data-loss safety net (select-all+type or Ctrl+U is currently unrecoverable). Add an undo stack in internal/editor capturing buffer+cursor snapshots (or reversible ops). Coalesce consecutive typing into one undo group; each structural op (newline, delete, paste, cut, delete-selection, kill-line, word-delete) is its own group. Bound history (e.g. 500 entries). Keys: Ctrl+Z undo, Ctrl+Y (and Ctrl+Shift+Z) redo. Restore cursor + scroll on undo/redo. Mark Dirty appropriately.
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria
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- [ ] #1 Ctrl+Z reverts the last edit group; Ctrl+Y / Ctrl+Shift+Z redoes
- [ ] #2 Typing is coalesced; structural ops are separate groups
- [ ] #3 Cursor and selection state restored on undo/redo
- [ ] #4 Redo stack cleared on a new edit; history bounded
<!-- AC:END -->