REG->5.12 [Qt] Cannot drag text from QLineEdit and drop onto a widget unless setAcceptDrops is set on the drop site's parent

# -*- coding: utf-8 -*-
import sys

from PySide2.QtWidgets import QPushButton, QWidget, QLineEdit, QApplication


class Button(QPushButton):
    def __init__(self, title, parent):
        super().__init__(title, parent)
        self.setAcceptDrops(True)

    def dragEnterEvent(self, e):
        if e.mimeData().hasFormat('text/plain'):
            e.accept()
        else:
            e.ignore()

    def dropEvent(self, e):
        self.setText(e.mimeData().text())


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        # self.setAcceptDrops(True)  # FIXME: have to use this code in PySide2==5.12.0, otherwise, drag&drop doesn't work

    def initUI(self):
        edit = QLineEdit('', self)
        edit.setDragEnabled(True)
        edit.move(30, 65)

        button = Button("Button", self)
        button.move(190, 65)

        self.setWindowTitle('Simple drag and drop')
        self.setGeometry(300, 300, 300, 150)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    ex.show()
    app.exec_()