These commands removed, moved or copied one row or object at a time:
the Layers panel's Delete Selection, Duplicate Selection, Collect in
New Layer, row drags, Merge Selected, Flatten Artwork and Release to
Layers, and Cut Artboard, Duplicate Artboard and the Artboard tool's
Alt-drags that copy art. Each edit moved the later rows of the same
layer or group to other indices. The next lookup by id then walked the
tree, and after every fourth such walk Document::index_path rebuilt
the whole lookup cache. Release to Layers also walked the document
twice for each new layer to name and color it. With 25,000 rectangles
in one layer, a release build of vectorcraft-cli took 11.9 s for
Duplicate Selection and 17.7 s for Release to Layers.
The commands now remove, move and copy the rows in one pass over each
layer or group, with Document::remove_many and Document::wrap, and
with copy_above, the copy pass of duplicate_in, which Duplicate
Selection and the artboard copies now share. Release to Layers names
its new layers from one walk of the document. Merge Selected checks
the target layer's objects against a set of the listed rows, and
Delete Selection checks the top-level layers against such a set. In a
document whose ids are unique, the rows keep their order, new rows and
layers take the same ids, names and colors, and the selection, the
undo step and the journal are the same. A release build with this
change takes 98 ms for Duplicate Selection and 26 ms for Release to
Layers.
Docs: docs/target-app-parity.md.
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