When Accessibility is enabled and typing the full name of an existing user and pressing Tab, the user is not auto-selected in the Reference field.
Steps to Reproduce
1. Enable accessibility mode from user preferences.
2. Open the incident form incident.do.
3. Type a user's full name in the Caller field (for example, Abel Tuter) and press Tab.
Instead of Abel Tuter being selected and listed in the Reference field, the Reference field is empty.
Turn off Accessibility mode.
Related Problem: PRB1236277