Title is pretty self-explanatory – I get a lot of use out of fieldsets in models, but the lack of fieldsets in blocks is kind of a bummer! Any chance we could get that functionality?
I often find myself looking for this feature too, would love to see this addition.
This feature would be awesome.
Is there any trick to group fields in blocks?
It would be crazy to be able to create fieldset, such as :
- Styling
- Content
- Others
Please, add it ! 
You can find my investigations here : Fieldsets in blocks
Thanks for this !
Let’s add this feature ! 