Steps to reproduce:
- Open section Configuration -> Host groups and create host group with names "test".
- Now, navigate to place where multiselect provides option to select existing host groups and create a new one if needed (host editing form in 4.0 or host mass update form in latest versions).
- Try to create a new host group with upper case name "TEST".
Auto complete doesn't provide option "TEST (new)" because there is already host group with name lowercased "test".
Since host groups are case sensitive, multiselect should be able to distinguish "TEST" as new host group.