Implement fix for duplicate entries in visualisation list.

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

@@ -12,29 +12,33 @@ analytics = { path = "../../analytics" }
 ast = { path = "../../language/ast/impl" }
 base64 = "0.13"
 bimap = { version = "0.4.0" }
+engine-protocol = { path = "../../controller/engine-protocol" }
 enso-config = { path = "../../config" }
 enso-frp = { path = "../../../../lib/rust/frp" }
 enso-prelude = { path = "../../../../lib/rust/prelude" }
-engine-protocol = { path = "../../controller/engine-protocol" }
 enso-shapely = { path = "../../../../lib/rust/shapely" }
 enso-text = { path = "../../../../lib/rust/text" }
 ensogl = { path = "../../../../lib/rust/ensogl" }
 ensogl-component = { path = "../../../../lib/rust/ensogl/component" }
-ensogl-text-msdf = { path = "../../../../lib/rust/ensogl/component/text/src/font/msdf" }
-ensogl-hardcoded-theme = { path = "../../../../lib/rust/ensogl/app/theme/hardcoded" }
 ensogl-drop-manager = { path = "../../../../lib/rust/ensogl/component/drop-manager" }
+ensogl-hardcoded-theme = { path = "../../../../lib/rust/ensogl/app/theme/hardcoded" }
+ensogl-text-msdf = { path = "../../../../lib/rust/ensogl/component/text/src/font/msdf" }
 failure = { workspace = true }
-ordered-float = { workspace = true }
-span-tree = { path = "../../language/span-tree" }
+indexmap = "1.9.2"
 js-sys = { workspace = true }
 nalgebra = { workspace = true }
-serde_json = { workspace = true }
+ordered-float = { workspace = true }
 serde = { version = "1.0", features = ["derive"] }
+serde-wasm-bindgen = { workspace = true }
+serde_json = { workspace = true }
 sourcemap = "6.0"
+span-tree = { path = "../../language/span-tree" }
 uuid = { version = "0.8", features = ["serde", "v4", "wasm-bindgen"] }
 wasm-bindgen = { workspace = true }
-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

@@ -59,11 +59,13 @@ impl Signature {
 /// Generic definition of a visualization. Provides information about the visualization `Signature`,
 /// and a way to create new instances.
 #[derive(Clone, CloneRef, Derivative)]
-#[derivative(Debug)]
+#[derivative(Debug, PartialEq, Eq, Hash)]
 #[allow(missing_docs)]
 pub struct Definition {
     pub signature:   Signature,
     #[derivative(Debug = "ignore")]
+    #[derivative(PartialEq = "ignore")]
+    #[derivative(Hash = "ignore")]
     pub constructor: Rc<dyn Fn(&Application) -> InstantiationResult>,
 }
 

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

@@ -66,14 +66,15 @@ impl Registry {
     pub fn valid_sources(&self, tp: &enso::Type) -> Vec<visualization::Definition> {
         let type_map = self.type_map.borrow();
         let any_type = enso::Type::any();
-        let mut result: Vec<visualization::Definition> =
-            type_map.get(tp).cloned().unwrap_or_default();
+        // IndexSet preserves insertion order.
+        let mut result: indexmap::IndexSet<visualization::Definition> = default();
+        result.extend(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());
             }
         }
-        result
+        result.into_iter().collect()
     }
 
     /// Return the `visualization::Definition` that should be used as default for the given type.
@@ -130,3 +131,27 @@ 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);
+        }
+    }
+}