QQuickStyle virtually deletes QStyleOption objects

In qquickstyleitem.cpp there's code like this (see the switch in QQuickStyleItem::initStyleOption):

m_styleoption = new QStyleOptionButton();

where m_styleoption is a pointer to QStyleOption.

Since QStyleOption does not have a virtual destructor (OOPS?), the non-virtual deletion that then happens in QQuickStyleItem's dtor leaks memory and invokes undefined behaviour:

QQuickStyleItem::~QQuickStyleItem()
{
delete m_styleoption; // kaboom
m_styleoption = 0;
}