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gridcraft/crates/engine
prxnvt 2fce1a9b42 Objects: every kind follows edits; chart series follow cut-moves and sheet deletes
Structural edits and sorts kept three hand-indexed lists (charts, images,
shapes) in step in two places, and slicers were left out of both, so a
slicer stayed put when rows were inserted above it. Chart series were
rewritten for inserted and deleted lines and for sheet renames, but not for
cut-moves or sheet deletes, which left them pointing at the old cells.

- Inserting and deleting rows and columns and sorting walk
  `Sheet::object_anchors` and `object_anchors_mut`, one fixed order over
  every kind, so slicers now follow their cells by their anchor mode like
  the other objects, and a new kind cannot be forgotten in one of the
  passes.
- `rewrite_cell_links` is the one place that rewrites the references
  floating objects hold (chart series values, categories and names,
  and the source block a chart was made from).
  `rewrite_all_formulas` calls it, which covers inserting and deleting
  lines and cells and cut-moves on one sheet or across sheets; renaming and
  deleting a sheet call it too, so a series into a deleted sheet becomes
  #REF!, as a formula does.
- Copying a sheet gives its charts, pictures, shapes and slicers fresh ids,
  keeping ids unique across the workbook, which object selection and the
  `{kind, id}` commands rely on.

Tests: every kind through row and column inserts and deletes, an absolute
shape, a sort and undo; a slicer through inserted rows; chart series
through a cut-move, a sheet rename, a sheet delete and undo; ids after a
sheet copy.
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2026-10-30 15:42:10 -04:00