Commands: ids leave out an object listed with a group that holds it, as the selection does

Commands that read the selection through edit::selected_roots leave
out an object whose group is also selected (edit::roots_of). Fourteen
places that read `ids` kept an object listed together with its group.
Given ids that list an object and a group that holds it, Make Repeat
failed with "no such object", New Symbol failed or stored the object
twice in the symbol, and object.transform moved it twice (20 pt for a
10 pt move).

These places now pass explicit ids through edit::outermost, which
drops an id whose ancestor is also listed, with the filter that
roots_of runs on the selection (now edit::without_inner). Nothing else
is dropped or replaced: unlike roots_of, it keeps layers and
compound-path members. A list without nesting gives the same result as
before. Commands that take both ids and the selection as listed, such
as paint.setFill without item, are unchanged.

Docs: docs/mcp.md, docs/target-app-parity.md.

crates/engine/src/cmd/slices.rs

@@ -280,7 +280,7 @@ pub(crate) fn options_json(o: &SliceOptions) -> Value {
 
 fn make(s: &mut Session, p: &Value) -> Result<Value> {
     let ids = match ids_param(p, "ids") {
-        Some(ids) => ids,
+        Some(ids) => super::edit::outermost(&s.doc()?.doc, ids),
         None => super::edit::selected_roots(s)?,
     };
     let d = &s.doc()?.doc;