Cannot properly navigate through right-to-left text

The bug

You cannot properly navigate through right-to-left text (such as hebrew) if your language is set to a right-to-left language.

To reproduce

1. Set your game language to Hebrew or another right-to-left language
2. Open chat
3. Paste some right-to-left text into chat, for example

   מיינקראפט

4. Use the arrow keys to navigate through the text
5. The entire text moves, not just the cursor

Video

Minecraft 1.14 2019-04-24 17-50-48.mp4