Fix QSFPM not emitting dataChanged when source model is set

QSortFilterProxyModel did not emit dataChanged when calling
setSourceModel() after modifying the source model.
QSortFilterProxyModel::setSourceModel and
QSortFilterProxyModelPrivate::_q_sourceReset(), _q_clearMapping
is called to delete the source_index_mapping. They also need to
call create_mapping function to re-create it.

Fixes: QTBUG-87781
Pick-to: 5.15
Change-Id: Idbe34696c9d3a2fbf354b653c870bac61378811d
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/corelib/itemmodels/qsortfilterproxymodel.cpp b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
index f748a95160..fb09c22798 100644
--- a/src/corelib/itemmodels/qsortfilterproxymodel.cpp
+++ b/src/corelib/itemmodels/qsortfilterproxymodel.cpp
@@ -1479,6 +1479,7 @@ void QSortFilterProxyModelPrivate::_q_sourceReset()
     _q_clearMapping();
     // All internal structures are deleted in clear()
     q->endResetModel();
+    create_mapping(QModelIndex());
     update_source_sort_column();
     if (dynamic_sortfilter && update_source_sort_column())
         sort();
@@ -2042,6 +2043,7 @@ void QSortFilterProxyModel::setSourceModel(QAbstractItemModel *sourceModel)
     connect(d->model, SIGNAL(modelReset()), this, SLOT(_q_sourceReset()));
 
     endResetModel();
+    d->create_mapping(QModelIndex());
     if (d->update_source_sort_column() && d->dynamic_sortfilter)
         d->sort();
 }