1 files changed, 25 insertions, 4 deletions
diff --git a/src/widgets/itemviews/qtreewidget.cpp b/src/widgets/itemviews/qtreewidget.cpp
index a0af27115d..4768869843 100644
--- a/src/widgets/itemviews/qtreewidget.cpp
+++ b/src/widgets/itemviews/qtreewidget.cpp
@@ -390,6 +390,27 @@ bool QTreeModel::setData(const QModelIndex &index, const QVariant &value, int ro
     return false;
 }
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+bool QTreeModel::clearItemData(const QModelIndex &index)
+{
+    if (!checkIndex(index, CheckIndexOption::IndexIsValid))
+        return false;
+    QTreeWidgetItem *itm = item(index);
+    if (!itm)
+        return false;
+    const auto beginIter = itm->values.at(index.column()).cbegin();
+    const auto endIter = itm->values.at(index.column()).cend();
+    if (std::all_of(beginIter, endIter, [](const QWidgetItemData& data) -> bool { return !data.value.isValid(); })
+        && !itm->d->display.at(index.column()).isValid()) {
+        return true; //it's already cleared
+    }
+    itm->d->display[index.column()] = QVariant();
+    itm->values[index.column()].clear();
+    emit dataChanged(index, index, QVector<int>{});
+    return true;
+}
+#endif
+
 QMap<int, QVariant> QTreeModel::itemData(const QModelIndex &index) const
 {
     QMap<int, QVariant> roles;
@@ -635,7 +656,7 @@ void QTreeModel::ensureSorted(int column, Qt::SortOrder order,
             // we are going to change the persistent indexes, so we need to prepare
             if (!changed) { // this will only happen once
                 changed = true;
-                emit layoutAboutToBeChanged(); // the selection model needs to know
+                emit layoutAboutToBeChanged({parent}, QAbstractItemModel::VerticalSortHint); // the selection model needs to know
                 oldPersistentIndexes = persistentIndexList();
                 newPersistentIndexes = oldPersistentIndexes;
             }
@@ -668,7 +689,7 @@ void QTreeModel::ensureSorted(int column, Qt::SortOrder order,
     if (changed) {
         itm->children = lst;
         changePersistentIndexList(oldPersistentIndexes, newPersistentIndexes);
-        emit layoutChanged();
+        emit layoutChanged({parent}, QAbstractItemModel::VerticalSortHint);
     }
 }
 
@@ -2164,9 +2185,9 @@ void QTreeWidgetItem::sortChildren(int column, Qt::SortOrder order, bool climb)
     QTreeModel::SkipSorting skipSorting(model);
     int oldSortColumn = view->d_func()->explicitSortColumn;
     view->d_func()->explicitSortColumn = column;
-    emit model->layoutAboutToBeChanged();
+    emit model->layoutAboutToBeChanged({}, QAbstractItemModel::VerticalSortHint);
     d->sortChildren(column, order, climb);
-    emit model->layoutChanged();
+    emit model->layoutChanged({}, QAbstractItemModel::VerticalSortHint);
     view->d_func()->explicitSortColumn = oldSortColumn;
 }