Edit > Copy with a shape group (or a path, fill, stroke or path
operation) selected in a shape layer's Contents copied the whole layer,
and Paste made a new layer. As in After Effects, Copy now copies the
selected items, Paste puts them into each selected shape layer's
Contents (above its selected item, in that item's group, else on top,
with names kept unique there: "Rectangle 2"), and Cut removes them, so
Cut + Paste moves them. Pasting with no shape layer selected is an
error rather than a new layer. Copying anything else clears the shape
item clipboard, as it does the other clipboards.
Test: shape_contents_copy_cut_and_paste_between_shape_layers,
ctrl_c_and_ctrl_v_copy_a_shape_group_into_another_shape_layer.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>