I love that idea. And I think we could have a reasonable UI affordance: instead of an empty drop-box between rows, when we hover, we add small boxes in margins to the left and right of the target. As we move to the left third (say) of the row, we highlight the before box and on the right third we highlight the after box. We could even stagger the heights, so that before is higher than the target tag, which itself is slightly higher than after. There might even be some sort of locking mechanism so that we don’t move shadow templates by accident, only moving our own amidst them unless we explicitly unlock them.
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