Document-order chain used by the slot host to figure out where to render a
panel whose preferred slot is missing in the current form. Walks forward:
a panel registered for after-fields looks for the next existing slot down
the chain (after-related, then after-everything) until it finds one.
The chain is intentionally short — these are the only positions any panel
should ever need. New positions can be added by inserting into this array
at the right document-order position.
Document-order chain used by the slot host to figure out where to render a panel whose preferred slot is missing in the current form. Walks forward: a panel registered for
after-fieldslooks for the next existing slot down the chain (after-related, thenafter-everything) until it finds one.The chain is intentionally short — these are the only positions any panel should ever need. New positions can be added by inserting into this array at the right document-order position.