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Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.5.10, 6.8.5, 6.9.3, 6.10.0 Beta3, 6.11.0 FF
Affects Version/s: 6.8.2
Component/s: Core: Item Models
Labels:
None

Platform/s:

All
Story Points:
5
Commits:
38e94ffcb (dev), ec3509f55 (6.10), 324d359ac (6.9), e36269f70 (tqtc/lts-6.8), 0783a906d (tqtc/lts-6.5)
Sprint:
Foundation Sprint 135

With a specific setup calling QSortFilterProxyModel::setSourceModel will cause a crash with the following callstack:

With a spesific setup calling QSortFilterProxyModel::setSourceModel will cause a crash with the following callstack:                                                                                                                                                                                        
1   QtPrivate::QPropertyBindingData::d                       qpropertyprivate.h        308  0x7ffc107abef4 
2   QtPrivate::QPropertyBindingData::binding                 qpropertyprivate.h        265  0x7ffc107a8fd4 
3   QPropertyBindingDataPointer::binding                     qproperty_p.h             75   0x7ffc108f4a57 
4   QPropertyBindingDataPointer::firstObserver               qproperty_p.h             470  0x7ffc108f4ee9 
5   QObjectCompatProperty<QAbstractProxyModelPrivate,QAbs .. qproperty_p.h             666  0x7ffc10f4d0da 
6   QAbstractProxyModel::setSourceModel                      qabstractproxymodel.cpp   213  0x7ffc10f48305 
7   QSortFilterProxyModel::setSourceModel                    qsortfilterproxymodel.cpp 2054 0x7ffc10f676ae 
8   ProxyModel::toogleSource                                 proxymodel.cpp            24   0x7ff661716513

Attached an example that can reproduces this.

Some notes:
In Mail.qml if "objectName: model.display" is removed the crash does not happen
In ProxyModel::toogleSource() if you clear sourceModel and filterFixedString before changing source the crash does not happen