Text: duplicate during a text edit leaves no effect selected on the original (#2226)

Duplicate passes over the property selection an open edit kept and copies the edited layer,
but left that selection in place on the original. With the copy selected, the next Duplicate
copied the original's effect, shape item or text animator, and Clear would have removed it.
Ending the edit through Duplicate now clears that property selection along with it.

crates/engine/src/cmd/edit.rs

@@ -105,10 +105,11 @@ pub(crate) fn reid(layer: &mut Layer, next: &mut u64) {
 }
 
 fn duplicate(s: &mut Session, p: &Value) -> Result<Value> {
+    let editing = s.state.text_edit.is_some();
     // Effects selected → duplicate them (Edit ▸ Duplicate in Effect Controls). An open text edit
     // comes first, as it does for Clear: opening the editor keeps the property selection, but
     // while typing, Duplicate means the edited layer, not an effect or item selected before.
-    if p.get("layers").is_none() && s.state.text_edit.is_none() {
+    if p.get("layers").is_none() && !editing {
         let fx = super::effect::selected_effects(s);
         if !fx.is_empty() {
             let mut out = vec![];
@@ -151,6 +152,11 @@ fn duplicate(s: &mut Session, p: &Value) -> Result<Value> {
         relink_copies(comp, &map);
         proj.next_id = next;
         st.selected_layers = created.clone();
+        // The property selection the edit kept was passed over above and belongs to the
+        // originals: left in place, the next Duplicate or Clear would act on it, not the copies.
+        if editing {
+            st.selected_props.clear();
+        }
         Ok(created)
     })?;
     Ok(json!(new.iter().map(|l| l.0).collect::<Vec<_>>()))