Affects Version/s: Minecraft 18w01a
Fix Version/s: None
Environment:Windows 10, Java 8.
Put the summary of the bug you're having here
What I expected to happen was...:
"Done" button stays normal.
What actually happened was...:
"Done" button locks and i can unlock it only editing the pasted command. (This happens too when you don't select the command input and press any key except ESC.)
Steps to Reproduce:
1. Opens the command block.
2. Paste everything on command input.
3. And the "Done" button locks.
Note: My Minecraft it's in Portuguese.