ticket 602: Radio Button Validation Not Working (FOUR-3195) #282
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Fixes http://tickets.pm4overflow.com/tickets/602
The problem was caused by a Bootstrap bug that causes that the invalid-feedback css class doesn't work as expected in the case of radiobuttons and checkboxes: https://stackoverflow.com/questions/45673354/bootstrap-4-invalid-feedback-with-input-group-not-displaying