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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: None
Affects Version/s: 6.4.0
Component/s: PySide, Shiboken
Labels:
None
Environment:
Python 3.7.9
PySide 6.4.0

Platform/s:

Windows
Commits:
bacbf691b3 (pyside/pyside-setup/dev) bacbf691b3 (pyside/tqtc-pyside-setup/dev) 4f9645e9a2 (pyside/pyside-setup/6.4) 73edab21f3 (pyside/pyside-setup/6.3) 4f9645e9a2 (pyside/tqtc-pyside-setup/6.4) 73edab21f3 (pyside/tqtc-pyside-setup/6.3)

Description

Since upgrading to PySide 6.4 we have a very strange bug, where all list like properties end up with duplicated elements on the QML side, for example, the python list [1, 2, 3] will appear as [1, 2, 3, 1, 2, 3].

Minimal code to reproduce the issue:

qtBug.py:

from PySide6.QtCore import QObject, Property
from PySide6.QtGui import QGuiApplication
from PySide6.QtQml import QQmlApplicationEngine


class Context(QObject):
    @Property(list, constant=True)
    def foo(self):
        return [1, 2, 3]


if __name__ == '__main__':
    app = QGuiApplication()
    engine = QQmlApplicationEngine()
    context = Context()
    engine.rootContext().setContextProperty("context", context)
    engine.load("qtBug.qml")
    window = engine.rootObjects()[0]
    window.showNormal()
    app.exec()

qtBug.qml:

import QtQuick

Window {
    Text {
        text: context.foo.toString()  // Will appear as [1, 2, 3, 1, 2, 3]
    }
}

This is not just a toString() problem, using the list in a Repeater or checking .length will also show the duplication.

Python 3.10.6
Qt 6.4.1 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 11.3.0)
qml: onCompleted: 1,2,3,1,2,3
QSGThreadedRenderLoop: expose event received for window QQuickWindowQmlImpl(0x556bce2f42f0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title=6.4.1, geometry=0,0 0x0) with invalid geometry: QRect(0,0 0x0) on QScreen(0x556bce256df0, name=DVI-D-0)
QSGThreadedRenderLoop: expose event received for window QQuickWindowQmlImpl(0x556bce2f42f0 exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), title=6.4.1, geometry=0,0 0x0) with invalid geometry: QRect(0,0 0x0) on QScreen(0x556bce256df0, name=DVI-D-0)
qt.pyside.libpyside: qtPropertyMetacall ReadProperty #1 QVariantList/"foo" Context(0x558d2cac98e0)
file:///pyside2106/main.qml:5: TypeError: Cannot read property 'foo' of null

Python 3.10.6
Qt 6.3.2 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 10.3.1 20210422 (Red Hat 10.3.1-1)) [limited API]
qml: onCompleted: 1,2,3
file:///pyside2106/main.qml:5: TypeError: Cannot read property 'foo' of null