Addresses a bug causing inconsistent resizing of the send message textarea when the window width is small, and preventing it from returning to its minimum height after sending a message.

Problem:

The original textarea resizing logic relied on scrollHeight to determine the necessary height. However, this approach failed to account for how changes in window width affected the text wrapping and subsequent scrollHeight calculation. After sending a message and clearing the textarea's content, the scrollHeight often retained a value larger than the actual minimum height, preventing the textarea from shrinking as expected. This was particularly noticeable at smaller widths where text wrapping significantly impacts scrollHeight.

Solution:

This PR resolves the issue by explicitly resetting the textarea height to 1px before recalculating scrollHeight. This ensures that the browser computes the height based on the currently visible text as not doing so could lead to potentially caching stale scrolHeight after content cleared. The new calculation, using only sendTextArea.scrollHeight, is simpler and more accurate.

This change provides more reliable and consistent resizing behavior, ensuring the textarea shrinks correctly to its minimum height after sending a message, regardless of window width changes or previous text wrapping states.

Tests:

Before:

Excuse the potato quality as I can't upload more than 10MB. Just notice the size of the text area, here's a picture to show the px height:

After:

Chrome:

Firefox:

Checklist:

• I have read the Contributing guidelines.