requested to merge ATLAS-EGamma/athena:Isolation_selection_const_mess into master
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IsolationSelection rm un-needed const leading to const_cast, update test to work with shallow copies.
This follow a discussions in !57915 (merged)
Assuming the indent is really to work with Shallow copy container we do not need to pass them
This allowed me to remove one of two
const_cast. Ping @fwinkl .
Also lets update the test to do this .
There is another one which I assume is also prb due to a confusing part of the interface (we modify copies or not etc), but as this is different than the one I commented leaving this to @goblirsc and @schaffer