[FEATURE] Don't truncate long diff lines (2000-char cap hides edits in long paragraphs)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Diff lines longer than 2000 characters are cut off and shown as … [+N chars] (Edit/Write diffs in the transcript and permission prompts). Noticed after updating to 2.1.276.

In Markdown and similar files, a whole paragraph is often one long line. If Claude changes a word past char 2000, the diff shows no visible change. I can't properly review or approve the edit then.

Unless I'm missing something, there's no setting or env var to change this.

Proposed Solution

Either:

• a setting to disable or raise the limit, or
• truncation that always keeps the changed region of a line visible (show context around the word-diff instead of cutting at a fixed offset).

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

1. I have a .md file with a paragraph that's a single ~3000-char line.
2. I ask Claude to reword a sentence near the end of it.
3. The Edit diff shows the line cut off with … [+N chars]; the actual change is invisible.
4. With the change, I'd see and verify the edit directly in the diff.

Additional Context

Claude Code 2.1.276, Debian 12, kitty.