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diff --git a/src/qmlmodels/qqmllistcompositor_p.h b/src/qmlmodels/qqmllistcompositor_p.h
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+++ b/src/qmlmodels/qqmllistcompositor_p.h
@@ -0,0 +1,333 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQMLLISTCOMPOSITOR_P_H
+#define QQMLLISTCOMPOSITOR_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qvector.h>
+
+#include <private/qqmlchangeset_p.h>
+
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_AUTOTEST_EXPORT QQmlListCompositor
+{
+public:
+    enum { MinimumGroupCount = 3, MaximumGroupCount = 11 };
+
+    enum Group
+    {
+        Cache   = 0,
+        Default = 1,
+        Persisted = 2
+    };
+
+    enum Flag
+    {
+        CacheFlag       = 1 << Cache,
+        DefaultFlag     = 1 << Default,
+        PersistedFlag   = 1 << Persisted,
+        PrependFlag     = 0x10000000,
+        AppendFlag      = 0x20000000,
+        UnresolvedFlag  = 0x40000000,
+        MovedFlag       = 0x80000000,
+        GroupMask       = ~(PrependFlag | AppendFlag | UnresolvedFlag | MovedFlag | CacheFlag)
+    };
+
+    class Range
+    {
+    public:
+        Range() : next(this), previous(this) {}
+        Range(Range *next, void *list, int index, int count, uint flags)
+            : next(next), previous(next->previous), list(list), index(index), count(count), flags(flags) {
+            next->previous = this; previous->next = this; }
+
+        Range *next;
+        Range *previous;
+        void *list = nullptr;
+        int index = 0;
+        int count = 0;
+        uint flags = 0;
+
+        inline int start() const { return index; }
+        inline int end() const { return index + count; }
+
+        inline int groups() const { return flags & GroupMask; }
+
+        inline bool inGroup() const { return flags & GroupMask; }
+        inline bool inCache() const { return flags & CacheFlag; }
+        inline bool inGroup(int group) const { return flags & (1 << group); }
+        inline bool isUnresolved() const { return flags & UnresolvedFlag; }
+
+        inline bool prepend() const { return flags & PrependFlag; }
+        inline bool append() const { return flags & AppendFlag; }
+    };
+
+    class Q_AUTOTEST_EXPORT iterator
+    {
+    public:
+        inline iterator() = default;
+        inline iterator(Range *range, int offset, Group group, int groupCount);
+
+        bool operator ==(const iterator &it) const { return range == it.range && offset == it.offset; }
+        bool operator !=(const iterator &it) const { return range != it.range || offset != it.offset; }
+
+        bool operator ==(Group group) const { return range->flags & (1 << group); }
+        bool operator !=(Group group) const { return !(range->flags & (1 << group)); }
+
+        Range *&operator *() { return range; }
+        Range * const &operator *() const { return range; }
+        Range *operator ->() { return range; }
+        const Range *operator ->() const { return range; }
+
+        iterator &operator +=(int difference);
+
+        template<typename T> T *list() const { return static_cast<T *>(range->list); }
+        int modelIndex() const { return range->index + offset; }
+
+        void incrementIndexes(int difference) { incrementIndexes(difference, range->flags); }
+        void decrementIndexes(int difference) { decrementIndexes(difference, range->flags); }
+
+        inline void incrementIndexes(int difference, uint flags);
+        inline void decrementIndexes(int difference, uint flags);
+
+        void setGroup(Group g) { group = g; groupFlag = 1 << g; }
+
+        Range *range = nullptr;
+        int offset = 0;
+        Group group = Default;
+        int groupFlag = 0;
+        int groupCount = 0;
+        int index[MaximumGroupCount] = { 0 };
+
+        int cacheIndex() const {
+            return index[Cache];
+        }
+
+        void setCacheIndex(int cacheIndex) {
+            index[Cache] = cacheIndex;
+        }
+    };
+
+    class Q_AUTOTEST_EXPORT insert_iterator : public iterator
+    {
+    public:
+        inline insert_iterator() {}
+        inline insert_iterator(const iterator &it) : iterator(it) {}
+        inline insert_iterator(Range *, int, Group, int);
+        inline ~insert_iterator() {}
+
+        insert_iterator &operator +=(int difference);
+    };
+
+    struct Change
+    {
+        inline Change() = default;
+        inline Change(const iterator &it, int count, uint flags, int moveId = -1);
+        int count = 0;
+        uint flags = 0;
+        int moveId = 0;
+        int index[MaximumGroupCount] = { 0 };
+
+        int cacheIndex() const {
+            return index[Cache];
+        }
+
+        void setCacheIndex(int cacheIndex) {
+            index[Cache] = cacheIndex;
+        }
+
+        inline bool isMove() const { return moveId >= 0; }
+        inline bool inCache() const { return flags & CacheFlag; }
+        inline bool inGroup() const { return flags & GroupMask; }
+        inline bool inGroup(int group) const { return flags & (CacheFlag << group); }
+
+        inline int groups() const { return flags & GroupMask; }
+    };
+
+    struct Insert : public Change
+    {
+        Insert() {}
+        Insert(const iterator &it, int count, uint flags, int moveId = -1)
+            : Change(it, count, flags, moveId) {}
+    };
+
+    struct Remove : public Change
+    {
+        Remove() {}
+        Remove(const iterator &it, int count, uint flags, int moveId = -1)
+            : Change(it, count, flags, moveId) {}
+    };
+
+    QQmlListCompositor();
+    ~QQmlListCompositor();
+
+    int defaultGroups() const { return m_defaultFlags & ~PrependFlag; }
+    void setDefaultGroups(int groups) { m_defaultFlags = groups | PrependFlag; }
+    void setDefaultGroup(Group group) { m_defaultFlags |= (1 << group); }
+    void clearDefaultGroup(Group group) { m_defaultFlags &= ~(1 << group); }
+    void setRemoveGroups(int groups) { m_removeFlags = PrependFlag | AppendFlag | groups; }
+    void setGroupCount(int count);
+
+    int count(Group group) const;
+    iterator find(Group group, int index);
+    iterator find(Group group, int index) const;
+    insert_iterator findInsertPosition(Group group, int index);
+
+    const iterator &end() { return m_end; }
+
+    void append(void *list, int index, int count, uint flags, QVector<Insert> *inserts = nullptr);
+    void insert(Group group, int before, void *list, int index, int count, uint flags, QVector<Insert> *inserts = nullptr);
+    iterator insert(iterator before, void *list, int index, int count, uint flags, QVector<Insert> *inserts = nullptr);
+
+    void setFlags(Group fromGroup, int from, int count, Group group, int flags, QVector<Insert> *inserts = nullptr);
+    void setFlags(iterator from, int count, Group group, uint flags, QVector<Insert> *inserts = nullptr);
+    void setFlags(Group fromGroup, int from, int count, uint flags, QVector<Insert> *inserts = nullptr) {
+        setFlags(fromGroup, from, count, fromGroup, flags, inserts); }
+    void setFlags(const iterator from, int count, uint flags, QVector<Insert> *inserts = nullptr) {
+        setFlags(from, count, from.group, flags, inserts); }
+
+    void clearFlags(Group fromGroup, int from, int count, Group group, uint flags, QVector<Remove> *removals = nullptr);
+    void clearFlags(iterator from, int count, Group group, uint flags, QVector<Remove> *removals = nullptr);
+    void clearFlags(Group fromGroup, int from, int count, uint flags, QVector<Remove> *removals = nullptr) {
+        clearFlags(fromGroup, from, count, fromGroup, flags, removals); }
+    void clearFlags(const iterator &from, int count, uint flags, QVector<Remove> *removals = nullptr) {
+        clearFlags(from, count, from.group, flags, removals); }
+
+    bool verifyMoveTo(Group fromGroup, int from, Group toGroup, int to, int count, Group group) const;
+
+    void move(
+            Group fromGroup,
+            int from,
+            Group toGroup,
+            int to,
+            int count,
+            Group group,
+            QVector<Remove> *removals = nullptr,
+            QVector<Insert> *inserts = nullptr);
+    void clear();
+
+    void listItemsInserted(void *list, int index, int count, QVector<Insert> *inserts);
+    void listItemsRemoved(void *list, int index, int count, QVector<Remove> *removals);
+    void listItemsMoved(void *list, int from, int to, int count, QVector<Remove> *removals, QVector<Insert> *inserts);
+    void listItemsChanged(void *list, int index, int count, QVector<Change> *changes);
+
+    void transition(
+            Group from,
+            Group to,
+            QVector<QQmlChangeSet::Change> *removes,
+            QVector<QQmlChangeSet::Change> *inserts);
+
+private:
+    Range m_ranges;
+    iterator m_end;
+    iterator m_cacheIt;
+    int m_groupCount;
+    int m_defaultFlags;
+    int m_removeFlags;
+    int m_moveId;
+
+    inline Range *insert(Range *before, void *list, int index, int count, uint flags);
+    inline Range *erase(Range *range);
+
+    struct MovedFlags
+    {
+        MovedFlags() {}
+        MovedFlags(int moveId, uint flags) : moveId(moveId), flags(flags) {}
+
+        int moveId;
+        uint flags;
+    };
+
+    void listItemsRemoved(
+            QVector<Remove> *translatedRemovals,
+            void *list,
+            QVector<QQmlChangeSet::Change> *removals,
+            QVector<QQmlChangeSet::Change> *insertions = nullptr,
+            QVector<MovedFlags> *movedFlags = nullptr);
+    void listItemsInserted(
+            QVector<Insert> *translatedInsertions,
+            void *list,
+            const QVector<QQmlChangeSet::Change> &insertions,
+            const QVector<MovedFlags> *movedFlags = nullptr);
+    void listItemsChanged(
+            QVector<Change> *translatedChanges,
+            void *list,
+            const QVector<QQmlChangeSet::Change> &changes);
+
+    friend Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor &list);
+};
+
+Q_DECLARE_TYPEINFO(QQmlListCompositor::Change, Q_PRIMITIVE_TYPE);
+Q_DECLARE_TYPEINFO(QQmlListCompositor::Remove, Q_PRIMITIVE_TYPE);
+Q_DECLARE_TYPEINFO(QQmlListCompositor::Insert, Q_PRIMITIVE_TYPE);
+
+QT_WARNING_PUSH
+// GCC isn't wrong, as groupCount is public in iterator, but we tried Q_ASSUME(),
+// right in front of the loops, and it didn't help, so we disable the warning:
+QT_WARNING_DISABLE_GCC("-Warray-bounds")
+inline QQmlListCompositor::iterator::iterator(
+        Range *range, int offset, Group group, int groupCount)
+    : range(range)
+    , offset(offset)
+    , group(group)
+    , groupFlag(1 << group)
+    , groupCount(groupCount)
+{
+    for (int i = 0; i < groupCount; ++i)
+        index[i] = 0;
+}
+
+inline void QQmlListCompositor::iterator::incrementIndexes(int difference, uint flags)
+{
+    for (int i = 0; i < groupCount; ++i) {
+        if (flags & (1 << i))
+            index[i] += difference;
+    }
+}
+
+inline void QQmlListCompositor::iterator::decrementIndexes(int difference, uint flags)
+{
+    for (int i = 0; i < groupCount; ++i) {
+        if (flags & (1 << i))
+            index[i] -= difference;
+    }
+}
+QT_WARNING_POP // -Warray-bounds
+
+inline QQmlListCompositor::insert_iterator::insert_iterator(
+        Range *range, int offset, Group group, int groupCount)
+    : iterator(range, offset, group, groupCount) {}
+
+inline QQmlListCompositor::Change::Change(const iterator &it, int count, uint flags, int moveId)
+    : count(count), flags(flags), moveId(moveId)
+{
+    for (int i = 0; i < MaximumGroupCount; ++i)
+        index[i] = it.index[i];
+}
+
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor::Group &group);
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor::Range &range);
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor::iterator &it);
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor::Change &change);
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor::Remove &remove);
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor::Insert &insert);
+Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QQmlListCompositor &list);
+
+QT_END_NAMESPACE
+
+#endif