Drag from a QListWidget causing crash

[Niagarer]

Hi!
This is surely something trivial, but I just don't get it. Unfortunately, the QtForPython documentation does not really address this (yet).
I am trying to implement the simplest possible drag and drop system between a QListWidget and a QGraphicsView. Basically, this should just send a string to the QGraphicsView.
You can just copy the code.

import sys
from PySide2.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QListWidget, QListWidgetItem, QAbstractItemView
from PySide2.QtCore import QMimeData, QByteArray

class ClassesListWidget(QListWidget):
    def __init__(self):
        super(ClassesListWidget, self).__init__()

        self.addItem(QListWidgetItem('first'))
        self.addItem(QListWidgetItem('second'))

        self.setSelectionMode(QAbstractItemView.SingleSelection)
        self.setDragEnabled(True)
        self.viewport().setAcceptDrops(True)
        self.setDropIndicatorShown(True)


    def mimeTypes(self):
        return ['text/plain']

    def mimeData(self, items):
        mime_data = QMimeData()
        data = QByteArray(bytes('testdata', 'utf-8'))
        mime_data.setData('text/plain', data)
        return mime_data


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setCentralWidget(ClassesListWidget())


if __name__ == '__main__':
    app = QApplication(sys.argv)

    mw = MainWindow()
    mw.show()

    sys.exit(app.exec_())

it works without the mimeData method (but of course, I want to transfer a specific string, not the item itself). With the method, the application just crashes when I try to drag an item without any further useful error message
Do you know whats wrong with the code above?
Thanks!

[SGaist]

Hi,

Would you mind sharing the rest of the script so that people can try reproducing your issue ?

By the way, are you using PySide2 or PyQt5 ? Which version ? On what OS ?

[Niagarer]

@SGaist
Yeah, it's actually just that, I don't drag any items outside, the dragging itself is the problem (so the environment shouldn't matter I guess).
I just updated the question with a small working code producing the same result.

Sorry, forgot to point out, I am using PySide2-5.14.0 on Win10

[SGaist]

Well, there's nothing fundamentally wrong that I can see with what you wrote so I think you may have found a bug in PySide2. It also crashes on macOS.

Please check the bug report system to see if there's already something there. If not, please open a new report providing the code you posted here.

[Niagarer]

@SGaist Oh, really! Ok...
Bugreport

[SGaist]

Thanks !