Fixed: QSortFilterProxyModel setDynamicSortFilter doesn't works when setting the model initially

This was caused by two different bug:
 - In the QSortFilterProxyModel, we need to re-sort when setting the
   source model change the sorting column (happen when setting a model
   initially)
 - In the treeview, we need to activate the sorting even if there is no
   column yet (because the initial model is empty

Task-number: 254234
Reviewed-by: Thierry
BT:

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp b/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
index bd66fdf008..80d90a6790 100644
--- a/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
+++ b/tests/auto/qsortfilterproxymodel/tst_qsortfilterproxymodel.cpp
@@ -2585,6 +2585,16 @@ void tst_QSortFilterProxyModel::task248868_dynamicSorting()
         QModelIndex index = proxy1.index(row, 0, QModelIndex());
         QCOMPARE(proxy1.data(index, Qt::DisplayRole).toString(), expected.at(row));
     }
+
+    //set up the sorting before seting the model up
+    QSortFilterProxyModel proxy2;
+    proxy2.setDynamicSortFilter(true);
+    proxy2.sort(0);
+    proxy2.setSourceModel(&model2);
+    for (int row = 0; row < proxy2.rowCount(QModelIndex()); ++row) {
+        QModelIndex index = proxy2.index(row, 0, QModelIndex());
+        QCOMPARE(proxy2.data(index, Qt::DisplayRole).toString(), expected.at(row));
+    }
 }
 
 class QtTestModel: public QAbstractItemModel