Crash in QList

This issue relates to the crash report №23765, №23750, №23858.

I had 3 crash reports that fell in the same place.

1. In the beginning was "foreach"

   foreach (Item *item, itemList)

2. The macro expanded into a call to the list copy constructor QList<>(const QList<> &)
3. Then there was a crash in this constructor (qlist.h : 812):

   if (!d->ref.ref())

   Apparently d is null.

Will qAsConst help here?

foreach (Item *item, qAsConst(itemList))