[Interest] QList operator[]

[Keith Gardner]

>
> QList can return a const & with the [] operator [1]. The documantation
> even says it's the same as .at().
>
> [1] http://doc.qt.io/qt-5/qlist.html#operator-5b-5d-2
>
> That is true if the QList is const when calling the function.  If it is
not, the other operator [1] documentation describes the behavior.

[1] http://doc.qt.io/qt-5/qlist.html#operator-5b-5d
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