QLineEdit Validator stays red after the text has been changed for a correct one

Expected behavior:
Entering an "incorrect" text while using a validator should paint the QLineEdit red.
Afterwards, when re-entering a "correct" text inside of the same validator a new paint
event should happen and the QLineEdit should be restore to its original color.

Actual behavior:
When entering a "correct" text after an "incorrect" one, the QLineEdit remains red.