Remove Shape::merge_shape

It is no longer being used.

crates/fj-kernel/src/shape/api.rs

@@ -99,31 +99,6 @@ impl Shape {
         object.merge_into(self)
     }
 
-    /// Merge the provided shape into this one
-    ///
-    /// Returns a [`Mapping`] that maps each object from the merged shape to the
-    /// merged objects in this shape.
-    pub fn merge_shape(&mut self, other: &Shape) {
-        for object in other.curves() {
-            object.get().merge_into(self);
-        }
-        for object in other.surfaces() {
-            object.get().merge_into(self);
-        }
-        for object in other.vertices() {
-            object.get().merge_into(self);
-        }
-        for object in other.edges() {
-            object.get().merge_into(self);
-        }
-        for object in other.cycles() {
-            object.get().merge_into(self);
-        }
-        for object in other.faces() {
-            object.get().merge_into(self);
-        }
-    }
-
     /// Access an iterator over all curves
     ///
     /// The caller must not make any assumptions about the order of curves.