784ff4abc0
Armature Edit mode has its own undo handling, which didn't store the number of root bone collections in the armature. Now it does. An alternative would be to not store this in the undo step, but rather loop over all bone collections to find the minimum `child_index`. This would be linear in the number of bone collections, though, so I chose to use a few more bytes of memory to make the undo system a little faster.
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