Can not type accented text in textfield echo mode.

Steps to reproduce:

1. Open the attached project.
2. Click on Text field Now press the keys option + n together and with slight delay press 'a'.
3. click show button and do same as step 2.
4. You will see 'a'  and 'ã' which are two different character with same input sequence. 'a' occur when echo mode was password and 'ã'  occur when echo mode is normal.