Commandblock "Done" button

The "Done" button does not become clickable/unclickable at the right times.

How to reproduce:

• Place a new commandblock
• See how the "Done" button is available to click
• Press on a key while in the interface, this makes the "Done" button unclickable (except for F2, because this button has a functionality when in the interface). This even happens if you click outside of the command box and click on a key
• The "Done" button will only appear again if you press a key again AND there are at least 2 characters in the command input box.