<textarea> with Greek contents crashes the page

When using a `textarea` as input, memory footprint is much higher compared with `text` input or `hidden` input.
If you are using long Greek contents, this may crash your page entirely.

##### Steps to Reproduce

1. Create a Trix editor with `textarea` as input.
2. Make sure CSS `textarea` does NOT include `display: none;`
3. Enter Greek contents ~40K characters

##### Notes
- Applying style `display: none;` to `` element compensates and stabilizes.
- Compared with `<input type="text">` or `<input type="hidden">`, memory footprint is ~40% higher on average.
- See [CodePen](https://codepen.io/dafbyte/pen/eYRYpoM) for reference

##### Details
* Trix version: 1.3.1
* Browser name and version: 92.0.4515.159 (64-bit)
* Operating system: Windows 10 Business (64-bit)