Details
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Bug
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Resolution: Invalid
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Not Evaluated
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None
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5.14.1
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None
Description
It seems that QPersistentModelIndexes are corrupted internally when dataChanged signal is emitted. This makes it impossible for a slot or anybody connected to the signal to refer to the model using a persistent model index, it also makes it impossible to compare the persistent indexes (which leads to a segfault).
This can be reproduced on the official editable tree model example.
QPersistentModelIndex pmi = model->index(0,0,QModelIndex());
qDebug() << "woah" << pmi.isValid(); // << valid
connect(model, &TreeModel::dataChanged, [&]() {
auto lol = (pmi == model->index(0,0,QModelIndex())); // << operator==() will crash
qDebug() << "hey" << pmi.isValid(); // << invalid & corrupted internally
QMetaObject::invokeMethod(this,
[&]{
qDebug() << "wut" << pmi.isValid(); // << still invalid
},Qt::QueuedConnection);
});