Implement fix for duplicate entries in visualisation list.

app/gui/view/graph-editor/Cargo.toml

@@ -38,3 +38,6 @@ serde-wasm-bindgen = { workspace = true }
 [dependencies.web-sys]
 version = "0.3.4"
 features = ["TextMetrics", 'CanvasRenderingContext2d', 'HtmlHeadElement']
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.8"

app/gui/view/graph-editor/src/component/visualization/definition.rs

@@ -87,6 +87,14 @@ impl Definition {
     }
 }
 
+impl PartialEq for Definition {
+    fn eq(&self, other: &Self) -> bool {
+        self.signature == other.signature && Rc::ptr_eq(&self.constructor, &other.constructor)
+    }
+}
+
+impl Eq for Definition {}
+
 
 // === Result ===
 

app/gui/view/graph-editor/src/component/visualization/registry.rs

@@ -70,7 +70,11 @@ impl Registry {
             type_map.get(tp).cloned().unwrap_or_default();
         if tp != &any_type {
             if let Some(vis_for_any) = type_map.get(&any_type) {
-                result.extend(vis_for_any.iter().cloned());
+                for vis in vis_for_any {
+                    if !result.contains(vis) {
+                        result.push(vis.clone_ref());
+                    }
+                }
             }
         }
         result
@@ -130,3 +134,27 @@ impl Default for Registry {
         Registry::new()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use wasm_bindgen_test::wasm_bindgen_test;
+
+    fn assert_no_duplicates<T: Eq + Hash + Debug + Clone>(items: &[T]) {
+        let vec_length = items.len();
+        let set: HashSet<T> = items.iter().cloned().collect();
+        assert_eq!(set.len(), vec_length, "Duplicate entries found: {items:?}");
+    }
+
+    #[wasm_bindgen_test]
+    fn assert_no_duplicate_default_visualisations() {
+        let registry = Registry::new();
+        registry.add_default_visualizations();
+
+        for entry in registry.type_map.borrow().values() {
+            let signatures = entry.iter().map(|class| class.signature.clone()).collect_vec();
+            assert_no_duplicates(&signatures);
+        }
+    }
+}