[PyQt] posible PyQt 5.12 bug?

[José Antonio Fernández Fernández]

Hi all. I've updated from PyQt 5.11.3 to 5.12, and this simple code
does not run (QFileDialog is not displayed). It can be a bug ?.
regards

from PyQt5.QtWidgets import QFileDialog
parent = QtWidgets.QApplication.activeModalWidget()
base_dir = "/home/foo"
filter = "*.*"
QFileDialog.getSaveFileName(parent,"caption example",base_dir , filter)
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