QLineEdit password echo mode odd behavior with composite characters

I think I found an odd behavior in QLineEdit that can be considered a bug.
With keyboard layout set to English International or English Alternative International in order to be able to type accented or composite characters like áéíóú (that is, an ' followed by an 'a' and so on)

Scenario A:
1. Instantiate a QLineEdit
2. Leave echoMode unchanged as default ("Normal").
3. Type accented characters, ie. "áéí".
4. QLineEdit text() method returns correct text: "áéí".

Scenario B:
1. Instantiate a QLineEdit
2. Set echoMode to "Password" right after instantiation and before any text has been entered in this component.
3. Type accented characters, ie. "áéí".
4. QLineEdit text() method returns INCORRECT text: "'a'e'i".

Scenario C:
1. Instantiate a QLineEdit
2. Leave echoMode unchanged ("Normal")
3. Type some text
4. Set echoMode to QLineEdit::Password
5. Type accented characters, ie. "áéí".
6. QLineEdit text() method returns CORRECT text: "áéí".

Scenario C can be accomplished by connecting the QLineEdit::textChanged(QString) signal to some slot in wich QLineEdit::setEchoMode(QLineEdit::Password) is invoked.