alonso.torres 936aa3f29f ✨ Store a swap inside a copy as an override group
A swapped copy sub-head now keeps the shape-ref of the main child it
replaces (its position), takes its content from its own component, and
carries the touched group :swap-group. It used to point at the root of
the new component and store a swap slot naming the replaced child.

Every path reads and writes that form:
- sync pairs a swapped head with the child it replaces and syncs it
  from its own component; it takes from the replaced child only its
  placement: position, constraints and layout item attributes;
- reset undoes a swap in place, keeping the head's id and the other
  overrides of the copy;
- detach, paste and duplicate make a head that leaves every copy level
  a plain copy of its own component, and advance a deeper one by
  position; the children of a swapped head never advance;
- a variant switch keeps a swap stored this way, and counts only the
  copy's own swap, not one made in a main of the chain;
- update main replaces the main child with a clone of the swapped one,
  and from a swapped head updates its own component;
- a swap inside a copy keeps the old shape-ref and adds :swap-group;
  swapping back to the component of that position gives a plain nested
  copy whose children refer to the position's children; a swap inside
  a main is a plain nested copy.
Files that hold swap slots keep working until a migration converts
them. The component memories describe the model.

This fixes what came from the slot: reset of a swapped child cleared
the other overrides of the copy (F12) and gave copies of a main new
ids (F66); update main left a swap mark (F16); a second variant switch
lost the overrides (F29); grid cells did not pair a swapped child
(F44); a swapped child did not follow its position (F65). F49 keeps
failing, in another form.

The tests that asserted slots now assert the override group; the tests
of the slot code build the old form with :as-slot?.

Benchmark (lower quantile, ms; baseline / now / ratio):
  deepest-edit-through-three-levels    35.2 /  35.4 / 1.01
  edit-through-a-chain-of-dependents   68.9 /  68.7 / 1.00
  library-update-into-copies           83.1 /  77.5 / 0.93
  main-edit-into-10-copies              1.8 /   1.6 / 0.92
  main-edit-into-100-copies            15.4 /  15.4 / 1.00
  main-edit-into-1000-copies          153.1 / 151.1 / 0.99
  variant-switch-into-copies           32.1 /  32.4 / 1.01

AI-assisted-by: claude-opus-5-5

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-13 19:59:34 +02:00
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