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/mod.rs

@@ -340,9 +340,10 @@ pub(crate) fn checked_ids_param(s: &Session, p: &Value, key: &str, command: &str
     values.iter().map(|value| checked_id(s, value, command)).collect()
 }
 
-/// The objects a command acts on: `ids` when given (every one checked), else the selected objects.
+/// The objects a command acts on: `ids` when given (every one checked, and those inside another
+/// given one dropped), else the selected objects.
 pub(crate) fn checked_ids_or_selection(s: &Session, p: &Value, command: &str) -> Result<Vec<NodeId>> {
-    if p.get("ids").is_some() { checked_ids_param(s, p, "ids", command) } else { edit::selected_roots(s) }
+    if p.get("ids").is_some() { Ok(edit::outermost(&s.doc()?.doc, checked_ids_param(s, p, "ids", command)?)) } else { edit::selected_roots(s) }
 }
 
 pub(crate) fn checked_id(s: &Session, value: &Value, command: &str) -> Result<NodeId> {