Why Global Undo Sucks: Building Line-Level Undo/Redo for VS Code

Source: Dev.to

The Problem: Why Global Undo Fails Devs 😤

If you’ve been using VS Code long enough, you’ve probably had this moment:

1. You’re editing two different parts of a file.
2. You spot a typo on one line.
3. You hit Ctrl + Z.

Suddenly, something completely unrelated disappears.

Nothing is technically broken — but your flow is. 🫠

Global undo is time‑based. It rewinds the editor to a previous point in history, regardless of what you were trying to undo.

But developers don’t think in time. We think in intent:

• “Undo this line”
• “Revert that typo”
• “Bring back what this line used to be”

Instead, global undo answers a different question:

“What was the last edit operation?”

That mismatch is the entire reason Ghost Line exists.

Using Ghost Line 👻 (Start Here)

Ghost Line doesn’t replace native undo – it runs alongside it, without interfering. The core idea is simple: undo or redo only the current line, nothing else.

Keyboard Shortcuts ⌨️

Ghost Line is designed to be muscle‑memory friendly.

📸 Screenshot – VS Code Keyboard Shortcuts

Line‑Level Undo / Redo in Action 🎥

In the clip below I’m undoing and redoing changes only on the current line, without affecting the rest of the file. I then open the line‑level history picker to preview and restore a previous version of that line — no global undo, no collateral damage. 👻

📽 Demo – Line‑Level Undo / Redo + History Picker

Configuration That Actually Matters ⚙️

Ghost Line keeps configuration minimal and purposeful.

• Max history per line – limits how many snapshots are stored per line.
• Idle delay – controls how aggressively snapshots are captured.
• Shortcut toggle – lets you disable Ghost Line keybindings without uninstalling the extension.

No settings bloat. No micro‑tuning obsession.

📸 Screenshot – VS Code Settings (Ghost Line Configuration)

How Ghost Line Works (High‑Level) 🧠

• Each line maintains its own undo/redo history.
• History is snapshot‑based, not diff‑based.
• Line undo runs safely alongside native VS Code undo.

The internals deserve their own deep‑dive; this post is about getting value fast.

Edge Cases, Limitations, and What’s Next 🧩

Edge Cases Handled

Some problems are unavoidable — but manageable:

• Line‑number shifts due to inserts or deletes.
• Redo invalidation after new edits.
• Safe no‑ops when no history exists.
• Zero interference with native VS Code undo.

Ghost Line takes care to keep history consistent even when the file structure changes 🔄.

Current Limitations ⚠️

Ghost Line is precise — not magical. Right now:

• No block or range‑based undo.
• Multi‑line edits aren’t first‑class citizens.
• History is session‑scoped (not persisted across reloads).

This is intentional scope control, not a lack of ambition.

What’s Coming Next 🚧

Planned improvements include:

• Hover previews for undo/redo states.
• Better multi‑line awareness.

No timelines. No promises. Just direction 🧭.

Conclusion: Undo Should Respect Intent 🎯

Global undo optimizes for simplicity. Developers optimize for flow.

Ghost Line is an experiment in intent‑aware editing — undoing what you meant to undo, not whatever happened last.

This kind of feature belongs in extensions first, where ideas can be tested, broken, and refined. If global undo ever gets smarter, great. Until then, Ghost Line exists for those moments when precision matters 👻.

Thanks & Links 🙌

Thanks for reading!

Ghost Line started as a small experiment to fix a daily annoyance and slowly turned into a focused attempt at making undo feel less destructive.

If this resonated with you — or if Ctrl + Z has ever betrayed you — I’d love your feedback.

• Issues / Feature Requests – Bugs, edge cases, and ideas are always welcome.
• Contributions – PRs are appreciated, especially around correctness, UX, and edge cases.
• Discussion – Let’s start chatting in the comments below 😄

GitHub Repository: (replace with the actual repo URL)

[vaayam-L/ghost-line](https://github.com/Namasivaayam-L/ghost-line)

**VS Code Extension**:  
[**Ghost Line**](https://marketplace.visualstudio.com/items?itemName=namachu.ghost-line)

It’s an open‑source project, built in public.

If it saves you even one unnecessary undo — mission accomplished 👻✨  

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**P.S. A quick request! 📝**

This is actually my **first**‑ever technical blog post. I tried to keep it concise and respectful of your time, but I’m still learning.

I would genuinely appreciate feedback on the structure and writing style—let me know in the comments if the flow worked for you or if I should change things up for the next one!