Merge PR #1280 and expose constraint value visibility

src/scene/model/object.rs

@@ -85,6 +85,11 @@ pub enum PropValue {
     },
     /// The trailing "+ Add parameter" row in the Parameters section.
     ParamAddRow,
+    /// The Parameters section's leading header row (no-selection page only):
+    /// a global on/off toggle for whether any constraint pill in the
+    /// viewport shows its driven value/parameter-name text. Mirrors
+    /// `App::show_constraint_values`.
+    ParamsVisibilityToggle(bool),
 }
 
 /// A single property row in the Properties panel.

src/scene/selection.rs

@@ -754,7 +754,8 @@ impl Scene {
                                 | PropValue::FieldLwVaries { .. }
                                 | PropValue::EntityLink { .. }
                                 | PropValue::ParamRow { .. }
-                                | PropValue::ParamAddRow => continue,
+                                | PropValue::ParamAddRow
+                                | PropValue::ParamsVisibilityToggle(_) => continue,
                             }
                         };
                         out.push(choice(prop.field, prop.label, editor));
@@ -891,7 +892,8 @@ impl Scene {
                     | PropValue::FieldLwVaries { .. }
                     | PropValue::EntityLink { .. }
                     | PropValue::ParamRow { .. }
-                    | PropValue::ParamAddRow => return None,
+                    | PropValue::ParamAddRow
+                    | PropValue::ParamsVisibilityToggle(_) => return None,
                 })
             }
         }