Details
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Bug
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Resolution: Fixed
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P1: Critical
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6.5, 6.6
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None
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Linux/Wayland
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f905876d6 (dev), 0ae1c61f6 (6.6), 7eb239d43 (6.5)
Description
import QtQuick import QtQuick.Window Window { id: win width: 600 height: 600 visible: true title: 'sandbox' Rectangle { id: rectItem anchors.fill: parent color: 'lime' Component.onCompleted: () => rectItem.states.unshift(myState) State { id: myState when: win.width > 800 PropertyChanges { rectItem.color: 'blue' } } } }
This simple example tries to add a State to an Item's states property dynamically. When running the example, the unshift causes a segfault with this stack trace:
1 QQuickStateGroupPrivate::replace_states qquickstategroup.cpp 179 0x7ffff7b9c8ff 2 QV4::PropertyListPrototype::method_unshift qqmllistwrapper.cpp 416 0x7ffff753e183 3 QV4::FunctionObject::call qv4functionobject_p.h 169 0x7ffff7485789 4 QV4::Moth::VME::interpret qv4vme_moth.cpp 859 0x7ffff7485789 5 QV4::Moth::VME::exec qv4vme_moth.cpp 541 0x7ffff7489663 6 QV4::doCall qv4function.cpp 54 0x7ffff73ddbea 7 QV4::Function::call qv4function.cpp 79 0x7ffff73ddf99 8 operator() qv4function.cpp 30 0x7ffff73de127 9 QV4::convertAndCall<QV4::Function::call(QObject *, void * *, const QMetaType *, int, QV4::ExecutionContext *)::<lambda(const QV4::Value *, const QV4::Value *, int)>> qv4jscall_p.h 197 0x7ffff73de127 10 QV4::Function::call qv4function.cpp 27 0x7ffff73de127 11 QQmlJavaScriptExpression::evaluate qqmljavascriptexpression_p.h 246 0x7ffff753a0b8 12 QQmlBoundSignalExpression::evaluate qqmlboundsignal.cpp 195 0x7ffff74d7e8b 13 QQmlBoundSignal_callback qqmlrefcount_p.h 62 0x7ffff74d8780 14 QQmlNotifier::emitNotify qqmlnotifier.cpp 70 0x7ffff75626c5 15 doActivate<false> qobject.cpp 3884 0x7ffff5d9b15e 16 QMetaObject::activate qobject.cpp 4052 0x7ffff5d93920 17 QQmlComponentAttached::completed moc_qqmlcomponentattached_p.cpp 205 0x7ffff74e4dc0 18 QQmlObjectCreator::finalize qqmlobjectcreator.cpp 1497 0x7ffff756511b 19 QQmlComponentPrivate::complete qbipointer_p.h 131 0x7ffff74e62d3 20 QQmlComponentPrivate::completeCreate qqmlcomponent.cpp 1206 0x7ffff74ebeaf 21 QQmlComponent::completeCreate qqmlcomponent.cpp 1184 0x7ffff74ec610 22 QQmlComponentPrivate::createWithProperties qqmlcomponent.cpp 922 0x7ffff74ec610 23 QQmlComponent::create qqmlcomponent.cpp 873 0x7ffff74ecb74 24 QQmlApplicationEnginePrivate::finishLoad qqmlapplicationengine.cpp 135 0x7ffff74cac93 25 QQmlApplicationEnginePrivate::ensureLoadingFinishes qqmlapplicationengine.cpp 162 0x7ffff74cae64 26 QQmlApplicationEnginePrivate::startLoad qqmlapplicationengine.cpp 109 0x7ffff74cafa7 27 QQmlApplicationEngine::load qqmlapplicationengine.cpp 324 0x7ffff74cb24c 28 main main.cpp 14 0x402686
Side note: When using push() instead of unshift(), the state is successfully appended to the states list, but the state is not set when the State's condition applies.
This is a minimized example. The original use case is that a component A has some states defined and a component B inherits from A, but wants to add own states. Due to the restriction that the "first state wins", it is currently impossible to add a state with "higher priority".