GraphiteEditor/Graphite

Pen tool preview line disappearing during repeated undo

Open

#3790 opened on Feb 20, 2026

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 (0 comments) (0 reactions) (1 assignee)Rust (25,662 stars) (1,176 forks)batch import
Good First Issue

Description

When using the Pen tool to draw a path and pressing Ctrl+Z multiple times, the preview line (showing the segment from the last anchor to the cursor) would disappear after a certain number of undos.

Current behaviour:

https://github.com/user-attachments/assets/bac854dd-4e7e-438d-ae3f-c6fbd0133275

Expected behaviour:

https://github.com/user-attachments/assets/b0892632-a3ac-43be-ae33-d84d5ebcdf48

Contributor guide

Tech stack
rust
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Rust programming basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the undo/redo system in Graphite's source code to understand how it affects the Pen tool's preview line. Look at the history management module (likely in a file such as `history.rs`) and the Pen tool's state handling during undo operations. Check the issue for any linked PRs or comments for additional context, though none exist currently. Reproduce the bug locally to identify the specific undo step causing the preview to disappear.