[Development] QListWidget crash in Qt4.6 on windows

[GHui]

I create an object with QListWidget, and add 400 items(QListWidgetItem). When I select all items with mouse, and then click a button to execute item(i)->setHidden(true), the program will crash. But if I didn't select items with mouse, but others, such as Ctrl+a, it won't crash. 
I think, maybe something wrong mouse event response on QListWidget.

The error message is following.
-----------------------------------
ASSERT failure in QVector<T>::at: "index out of range", file ..\..\include/QtCore/../../src/corelib/tools/qvector.h, line 338 


qvector.h:338
----------------
336:   template <typename T> 337:  inline const T &QVector<T>::at(int i) const 338:  { Q_ASSERT_X(i >= 0 && i < d->size, "QVector<T>::at", "index out of range"); 339:   return p->array[i]; }

Any help will be appreciated.

Thanks,
GHui
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