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++ // Copyright (C) 2026 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
++ // Qt-Security score:significant reason:default
++
++ #ifndef QQMLPREVIEWOBJECTPATCH_P_H
++ #define QQMLPREVIEWOBJECTPATCH_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 <private/qv4executablecompilationunit_p.h>
++
++ #include <QtCore/qobject.h>
++
++ #include <vector>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace QQmlPreview {
++
++ enum class PatchResult: quint8 {
++ Failed, // The diff cannot be applied in place; the caller must do a full reload.
++ Rebuilt, // Component roots were rebuilt; left-over old expressions must be nulled.
++ PatchedInPlace, // Trivial diff: objects kept; their old expressions must be translated.
++ };
++
++ PatchResult applyDiff(std::vector<QObject *> &objects,
++ const QQmlRefPointer<QV4::ExecutableCompilationUnit> &oldUnit,
++ const QQmlRefPointer<QV4::ExecutableCompilationUnit> &newUnit);
++
++ // Translate still-live expressions from oldUnit to the function at the same
++ // index in newUnit (or nullptr if there is no newUnit). Re-evaluate them if necessary.
++ void refreshBindings(const QQmlRefPointer<QV4::ExecutableCompilationUnit> &oldUnit,
++ const QQmlRefPointer<QV4::ExecutableCompilationUnit> &newUnit = {});
++
++ // Point every resolved type reference in the engine that names oldUnit at newUnit.
++ void redirectResolvedTypeReferences(
++ QV4::ExecutionEngine *engine,
++ const QQmlRefPointer<QV4::CompiledData::CompilationUnit> &oldUnit,
++ const QQmlRefPointer<QV4::CompiledData::CompilationUnit> &newUnit);
++
++ } // namespace QQmlPreview
++
++ QT_END_NAMESPACE
++
++ #endif // QQMLPREVIEWOBJECTPATCH_P_H