---
id: TASK-027
title: Mouse drag-select in the editor
status: "\U0001F7E6 Backlog"
assignee: []
created_date: '2026-06-29 23:21'
labels:
  - feature
dependencies: []
priority: medium
ordinal: 27000
---

## Description

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Implement in-app text selection by mouse: press to anchor, drag (MouseActionMotion) to extend, release to finish — mirroring Shift+arrow selection (respects soft-wrap via MoveToVisual). Currently handleMouse only moves the cursor on left click; there is no drag handling. Also fix the docs/help which already list mouse select as if it works (README Keys table + any in-app help).
<!-- SECTION:DESCRIPTION:END -->

## Acceptance Criteria
<!-- AC:BEGIN -->
- [ ] #1 Left press anchors a selection at the click position
- [ ] #2 Dragging extends the selection to the pointer (soft-wrap aware)
- [ ] #3 Release leaves the selection active; a plain click with no drag clears it and just moves the cursor
- [ ] #4 README/help mouse-select claims match actual behavior
<!-- AC:END -->