Sort Gantt chart by alphabetical order

Description

Sort the Gantt ‘group by’ alphabetically rather than only chronologically

What are you trying to achieve

We book people in for shifts and it would be great to be able to view the gantt chart of their bookings alphabetically. Right now the list of people looks random because it is organised chronologically by their booking. If it could be alphabetical you can see who is booked and who is not. This also links in with being able to view items without timelines on the gannt under and empty group of something.