mayocream/koharu

Crash during "Save as..." with large project history

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#693 opened on May 12, 2026

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bughelp wanted

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Description

Problem: Spend quite some time changing every text box in a 50 page comic and fiddling with the segmentation mask. The folder grew to over 12 GB. While looking for a way to shrink it, I encountered that clicking "Save as..." will crash the application. I assume the memory runs out (tho I got 23 GB free RAM). Here the error message:

Cause: I think the root problem is actually the history. It seems to save every change of the segmentation mask as a separate full picture that is stored forever.

Suggestion: Add some option to clear the history or limit the history to X actions.

Contributor guide

Research direction
Investigate the history saving mechanism to understand why it stores full images; consider adding compression or limiting history size.
Tech stack
rust
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60