Repro Steps:

1) Click on the Height property input field.
2) Input a value of 32 into the Height Property input field.
3) Click outside of the input field. The 32 value will now set.
4) Click back into the Height.
5) Input a new value of 16 into the Height Property Field. Do not click away or perform any other keystrokes than typing '16'.
6) Press Ctrl+Z on the keyboard.

Observe how the value does not 'undo' back to 32.

Expected Result:
'Undoing' works inside active input fields.