Feature Request: Add Undo Functionality to Claude Code Prompt Text Area

Summary

Add undo capabilities to Claude Code's prompt text area with keyboard shortcuts:

• u in normal mode (vim-style undo)
• Ctrl+Z in all modes (universal undo)

Current State

Claude Code currently supports extensive vim-style text editing shortcuts in the prompt area including:

• Navigation (h/j/k/l, w/e/b, 0/$)
• Editing (x, dd, D, dw/de/db, cc, C)
• Insert modes (i/I/a/A/o/O)
• Repeat last change (.)

However, there is no undo functionality available, which is a fundamental text editing operation.

Proposed Feature

Implement undo functionality with two keyboard shortcuts:

1. u in normal mode: Vim-style undo command

• Follows vim conventions that users already expect
• Consistent with existing vim-style shortcuts
• Only active in normal mode to avoid conflicts

1. Ctrl+Z in all modes: Universal undo

• Works in both normal and insert modes
• Familiar to users from standard text editors
• Provides accessibility for non-vim users

Use Cases

• Accidental deletions: Users can recover from mistaken dd, D, or x operations
• Experimental editing: Users can try different approaches and revert changes
• Workflow continuity: Matches expectations from vim and standard editors
• Error recovery: Quick recovery from typing mistakes or unwanted changes

Implementation Considerations

• Maintain undo history for the current session
• Consider undo stack depth (suggest 50-100 operations)
• Ensure undo works with all existing editing operations
• Handle mode transitions properly (undo should work regardless of current mode)

Priority

Medium-High - This is a fundamental text editing feature that users expect in any editor with vim-style controls.