diff --git a/app-proto/src/assembly.rs b/app-proto/src/assembly.rs
index 15a7211..d571d0e 100644
--- a/app-proto/src/assembly.rs
+++ b/app-proto/src/assembly.rs
@@ -687,7 +687,9 @@ impl Assembly {
     }
     
     pub fn try_insert_element(&self, elt: impl Element + 'static) -> bool {
-        let can_insert = self.elements_by_id.with_untracked(|elts_by_id| !elts_by_id.contains_key(elt.id()));
+        let can_insert = self.elements_by_id.with_untracked(
+            |elts_by_id| !elts_by_id.contains_key(elt.id())
+        );
         if can_insert {
             self.insert_element_unchecked(elt);
         }