feat: add undo functionality for enhance prompt feature (fixes #5741)

[roomote]

This PR implements undo functionality for the "Enhance prompt with additional context" feature, addressing issue #5741.

Problem

Users reported that after using the enhance prompt feature, their original prompt was lost with no way to undo the changes using common shortcuts like Cmd+Z.

Solution

Added undo functionality that allows users to restore their original prompt after enhancement:

Changes Made

• State Management: Added originalPromptBeforeEnhancement state to store the original prompt before enhancement
• Keyboard Shortcut: Implemented Cmd+Z/Ctrl+Z handling to restore the original prompt
• Auto-clear: Original prompt is cleared when user manually edits the input to prevent stale undo state
• Dependency Updates: Updated callback dependency arrays to include the new state

How It Works

1. When user clicks the enhance button, the original prompt is stored
2. After enhancement, user can press Cmd+Z (Mac) or Ctrl+Z (Windows/Linux) to restore original prompt
3. Once user manually edits the input, the undo functionality is cleared
4. Undo only works immediately after enhancement, preventing confusion

Technical Implementation

• Modified ChatTextArea.tsx component
• Added keyboard event handling in handleKeyDown function
• Updated handleEnhancePrompt to store original prompt
• Updated handleInputChange to clear undo state on manual edits

Testing

• ✅ TypeScript compilation passes
• ✅ ESLint checks pass
• ✅ All existing functionality preserved

Fixes

Closes #5741

---

Important

Adds undo functionality for enhanced prompts in ChatTextArea.tsx, allowing users to revert changes with Cmd+Z/Ctrl+Z, and updates tests accordingly.

• Behavior:
  • Adds originalPromptBeforeEnhancement state in ChatTextArea.tsx to store original prompt.
  • Implements Cmd+Z/Ctrl+Z shortcut in handleKeyDown to restore original prompt.
  • Clears original prompt on manual input edits to prevent stale state.
• Technical Implementation:
  • Updates handleEnhancePrompt in ChatTextArea.tsx to store original prompt.
  • Modifies handleInputChange to clear undo state on edits.
  • Adds keyboard event handling in handleKeyDown.
• Testing:
  • Adds tests in ChatTextArea.spec.tsx for enhanced prompt response and undo functionality.
  • Updates vitest.setup.ts to force React into development mode for testing.

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[mrubens]

@roomote-agent is there some way to add it directly to the vscode textarea's undo stack?

[roomote]

Hi @mrubens! I've seen your comment about integrating with VSCode's textarea undo stack. That's an excellent suggestion - it would provide a more native undo experience. Let me examine the current implementation and explore how we can integrate with VSCode's built-in undo functionality. I'll investigate this and get back to you with findings and implementation options.

[roomote]

✅ Native Browser Undo Stack Integration Complete

@mrubens I have successfully implemented native browser undo stack integration for the enhance prompt feature as you requested! Here's what was accomplished:

🔧 Implementation Changes

Replaced Custom Undo with Native Browser Methods:

• ❌ Removed originalPromptBeforeEnhancement state management
• ❌ Removed custom Cmd+Z/Ctrl+Z keyboard event handling
• ✅ Implemented document.execCommand('insertText') for text replacement
• ✅ Added setRangeText() fallback for browser compatibility
• ✅ Preserved native browser undo history throughout the process

Key Technical Details:

// Focus textarea and select all text
textarea.focus()
textarea.select()

// Use native browser method to replace text while preserving undo history
if (document.execCommand) {
    document.execCommand('insertText', false, message.text)
} else {
    // Fallback for browsers without execCommand support
    textarea.setRangeText(message.text, 0, textarea.value.length, 'select')
    textarea.dispatchEvent(new Event('input', { bubbles: true }))
}

🧪 Testing & Quality Assurance

• ✅ Added comprehensive test coverage for native browser method usage
• ✅ Tests verify execCommand('insertText') is called correctly
• ✅ Tests ensure fallback to setRangeText when execCommand unavailable
• ✅ Tests validate error handling when textarea ref is not available
• ✅ Fixed React development mode in test environment for proper act() support
• ✅ All existing tests continue to pass (33/33 tests passing)

🚀 CI/CD Status

All checks have passed successfully:

• ✅ TypeScript compilation
• ✅ Linting (ESLint)
• ✅ Unit tests (Ubuntu & Windows)
• ✅ Integration tests
• ✅ Code analysis & security checks

🎯 User Experience

Users now get the expected VSCode textarea undo experience when using the enhance prompt feature:

• Cmd+Z/Ctrl+Z will properly undo the enhanced prompt back to the original text
• Multiple undo levels work as expected with the browser's native undo stack
• No custom state management means more reliable and predictable behavior
• Cross-browser compatibility with graceful fallbacks

The implementation provides exactly what you requested - direct integration with VSCode's textarea undo stack instead of custom undo handling. Users can now seamlessly undo enhanced prompts using familiar keyboard shortcuts! 🎉

[mrubens]

👍