Details
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Bug
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Resolution: Done
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P1: Critical
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None
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6.4.0
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None
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Python 3.7.9
PySide 6.4.0
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Windows
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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
Attachments
| For Gerrit Dashboard: PYSIDE-2106 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 441013,2 | Fix duplication of values in QML properties of type QVariantList | dev | pyside/pyside-setup | Status: MERGED | +2 | 0 |
| 441026,2 | Fix duplication of values in QML properties of type QVariantList | 6.4 | pyside/pyside-setup | Status: MERGED | +2 | 0 |
| 441027,2 | Fix duplication of values in QML properties of type QVariantList | 6.3 | pyside/pyside-setup | Status: MERGED | +2 | 0 |