Crash when calling QPainterPath::reserve() on an uninitialized QPainterPath

The following will crash:

QPainterPath p;
p.reserve(42);

This is because QPainterPath's default constructor doesn't create a d-pointer, but the QPainterPath::reserve() will still try to access it:

void QPainterPath::reserve(int size)
{
    Q_D(QPainterPath);
    if ((!d && size > 0) || (d && d->elements.capacity() < size)) {
        // Here d is null, but it will be dereferenced in both detach() and in the line after
        detach();
        d->elements.reserve(size);
    }
}

Maybe we're not supposed to call reserve on a fully empty QPainterPath, but the documentation doesn't mention this, and it is quite easy to make it crash...