Issue Overview

Textareas and inputs sync their state continuously, so for every change, a new undo level is created. This is unexpected as it is unlikely one would want to undo changes character by character. Additionally, this requires a lot of memory.

Steps to Reproduce (for bugs)

1. Create a code block, or any other block with a textarea or input element.
2. Type some text.
3. Undo changes and observer they happen character by character.