[Bug] paste-detection returns wrong addedText on deletions

[akramcodez]

Description

If a user deletes text, newText.slice(this.lastInputLength) in source/utils/paste-detection.ts returns garbage characters from the middle of the text instead of early-returning.

Environment

• OS: (e.g., macOS 14.0, Ubuntu 22.04, Windows 11)
• Node version: (run node --version)
• Nanocoder version: (run nanocoder --version)
• Provider: (e.g., Ollama, OpenRouter, OpenAI-compatible API)
• Model: (e.g., llama3.2, claude-3.5-sonnet)

Steps to Reproduce

1. Delete text in the prompt input.
2. Inspect the paste detection event payloads.

Expected Behavior

The logic should early-return if charsAdded <= 0.

Actual Behavior

It processes a negative offset and returns garbage characters.

Logs/Screenshots

N/A

Additional Context

• I have searched existing issues to ensure this is not a duplicate
• I can reproduce this issue consistently
• This issue occurs with the latest version of nanocoder

[hiarun02]

@akramcodez Hey, could you please assign this issue to me? I’d like to work on it.

[akramcodez]

Thanks for your interest, @hiarun02! I’ve just assigned you another issue. Please implement that fix first, and then let me know. If no one else shows interest, I’ll assign this one to you. Until then, it’s open for anyone.