The removeEvent(), hideEvents() and editName() actions need
the DiveEventItem they are applied to. This was transported
via QAction's user-data, which means casting to void and
back.
By using lambdas instead, this can be made perfectly type-safe:
First we are 100% sure that we have a DiveEventItem because
we check the result of a dynamic_cast<>. Then we can pass
it to the even using its proper type.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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