StackLayout will crashed when currentIndex is initialized as number less than -1

Steps to repoduce：

1. Create a qml project, and import QtQuick.Layouts 1.12 module
2. Initialize an object StackLayout
3. Set 'currentIndex' as -2 or any value less than -1
4. Run the project , you will see project crashed.

I have debugged this with source code and found function 'rearrange' of class QQuickStackLayout contains following code which maybe better to change it like '<= -1'.

if (d->currentIndex == -1 || d->currentIndex >= m_cachedItemSizeHints.count())
        return;