Issue #3401186 by Wim Leers, alexpott: Follow-up for #3382510: Throw...
Issue #3401186 by Wim Leers, alexpott: Follow-up for #3382510: Throw \LogicException when >1 #config_target in the same form targets the same property path
(cherry picked from commit 40084a52b0329dd9ce70e9d992a90cb64e4924d2)