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justinjohn0306
cbc2430f4f
Excel anchors a floating object to the grid in one of three ways, stored in the file as the drawing anchor's `editAs`: "move and size with cells" (twoCellAnchor, the default), "move but don't size with cells" (oneCellAnchor / editAs="oneCell") and "don't move or size with cells" (editAs="absolute"). GridCraft had no such concept: xlsx import dropped `editAs`, export always wrote a plain twoCellAnchor, and sorting/filtering never moved an object — so pictures stayed put when their rows were reordered. Model: add `AnchorMode` on `Anchor` (serde default = MoveAndSize, so existing documents round-trip unchanged). xlsx: read the anchor kind and `editAs` into the mode; write it back out (editAs="oneCell"/"absolute" as Excel does). Engine: sorting now moves objects anchored inside the sorted body with their lines, re-fitting "move and size" objects, keeping "move but don't size" objects' size, and leaving absolute ones pinned. Structural insert/delete honours the same rule (previously it moved every object's cell unconditionally and ignored shapes). New `object.setAnchorMode` command sets an object's mode; `arrange.selectionPane` reports it. Tests: sort moves images with their rows; absolute objects stay put across a sort and a row delete; move-only keeps its size; the mode survives an xlsx round-trip; the drawing fixture parses all three anchor kinds.