@fantasyz Yeah groups of constraints would be great, just collapsible folders. And perhaps each group (and each constraint for that matter) could have a pin to top/bottom option. New items would be added to no group and with no pin, so they would be between pinned top/bottom groups.

Oh, and with the pinning feature, maybe range constraints would be unique in that they are created with 'pin to bottom' set.

@fantasyz the keys are identical in my animation

It didn't show any warning notification as well . as it does if the start and last keys are not exactly same .

@fantasyz we have it planned here: Export improvements · #11 · EsotericSoftware/spine-editor