Give solid.move the copy half of its Move/Copy label (#498)

solid.move takes copy: true to keep the source bodies and transform a new copy of each, with a Create Copy box in the Move dialog. Designs without it save and load exactly as before.

crates/ui-egui/src/dialogs.rs

@@ -1854,7 +1854,12 @@ pub fn show(app: &mut SolveApp, ctx: &egui::Context) {
                         combo(ui, "sw_op", &OP_LABELS, operation);
                         ui.end_row();
                     }
-                    k @ Kind::Move { .. } => enter |= crate::dialogs_move::rows(ui, k),
+                    k @ Kind::Move { .. } => {
+                        enter |= crate::dialogs_move::rows(ui, k);
+                        row_label(ui, "Create Copy");
+                        extra_check(ui, &mut d.extra, "copy");
+                        ui.end_row();
+                    }
                     Kind::Hole { diameter, depth, kind, cb_diameter, cb_depth, cs_diameter, cs_angle, opts } => {
                         row_label(ui, "Extents");
                         let cur = if to_object_on(&d.inputs) { 1 } else { usize::from(opts.all) * 2 };
@@ -2195,9 +2200,12 @@ fn extra_choice(ui: &mut egui::Ui, extra: &mut serde_json::Map<String, Value>, i
 /// A checkbox stored in the dialog's extra parameters.
 fn extra_check(ui: &mut egui::Ui, extra: &mut serde_json::Map<String, Value>, key: &str) {
     let mut on = extra.get(key).and_then(Value::as_bool).unwrap_or(false);
-    if ui.checkbox(&mut on, "").changed() {
+    let r = ui.checkbox(&mut on, "");
+    if r.changed() {
         extra.insert(key.into(), json!(on));
     }
+    // The box carries no text of its own, so a scenario reaches it by its row handle.
+    publish_row(&r);
 }
 
 /// A value field stored in the dialog's extra parameters (`default` until edited).
@@ -3776,9 +3784,9 @@ pub fn for_feature(app: &SolveApp, id: u64, marker: Option<usize>) -> Option<Dia
             }
             d
         }
-        FeatureKind::Move { bodies, translate, rotate_axis, angle } => {
+        FeatureKind::Move { bodies, translate, rotate_axis, angle, copy } => {
             let mut d = start("solid.move")?;
-            crate::dialogs_move::for_feature(&mut d, bodies, translate, *rotate_axis, angle.as_ref());
+            crate::dialogs_move::for_feature(&mut d, bodies, translate, *rotate_axis, angle.as_ref(), *copy);
             d
         }
         other => {