[clazy] [Bug 365940] New: Warn when using non-owning smart pointers as associative container key

[Volker Krause via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=365940

            Bug ID: 365940
           Summary: Warn when using non-owning smart pointers as
                    associative container key
           Product: clazy
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: vkrause at kde.org
                CC: smartins at kde.org

Quoting -Wmarc: "The values of keys in an associated container are not supposed
to change over time, thus they are marked as const in the std containers. But
some types can change their values under the hood while being stored as const.
Examples of such types as QPointer, weak_ptr, QWeakPointer, but also
QPersistentModelIndex. As they change, the container's class invariants are
broken (order in sorted and hash value unordered associative containers), and
accessing such a container results in undefined behaviour."

Reproducible: Always

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