It appears that when we disable the TextArea, it does not match the styling of the other input components. My initial thought is that this is because of two things:
1. The <span class="k-textarea"> needs a k-state-disabled applied.
2. The themes need something like the following in the .scss:
I could be way off base here, of course. Here's a StackBlitz showing the issue with a current, ugly, workaround: https://stackblitz.com/edit/react-s8ugrr-57r5pk?file=app/main.jsx