🛠️ fix: Correct Unwanted Newlines after Undo in Textarea

[danny-avila]

Summary

Hopefully the last of Textarea changes, this one targeting a chrome quirk.

I enhanced the undo functionality in LibreChat's textarea to fix a Chrome-specific bug that left unwanted newlines after undoing pasted content. The purpose of this improvement is to ensure a smoother user experience, especially when users need to undo their actions within the chat input field.

Other Changes

• handle deprecated "backspace" identifier in KeyUp event handler
• revise recent documentation update about docker override file concerning deploy-compose.yml usage

Change Type

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

Testing

To ensure the fix worked as intended, I replicated the problematic scenario by:

1. Pasting multiline content into the chat input, observing the unwanted behavior of newline characters remaining after an undo operation.
2. Applying the fix, which involved capturing the undo event and trimming any unnecessary whitespace from the end of the input field's content.

Test Configuration:

• Browser: Google Chrome (latest version)
• Environment: Local development

I specifically focused on testing in Chrome, as the bug was Chrome-specific. However, I also verified behavior in Firefox and Safari to ensure my fix did not adversely affect functionality in those browsers.

For effective testing, one should:

1. Paste multiline text into the chat input.
2. Perform an undo action using Ctrl+Z (or Cmd+Z on a Mac).
3. Observe if any newline characters remain after the content has been undone.

Additionally, try starting with text already present in the textarea, then paste and undo to ensure the logic correctly handles content before the cursor.

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes

[danny-avila]