Fix model deduplication to use provider ID and model ID (#31750)

Previously only used model ID for deduplication, which incorrectly
filtered models with the same name from different providers.

Release Notes:

- Fix to make sure all provider models are shown in the model picker

crates/assistant_context_editor/src/language_model_selector.rs

@@ -46,53 +46,35 @@ pub fn language_model_selector(
 }
 
 fn all_models(cx: &App) -> GroupedModels {
-    let mut recommended = Vec::new();
+    let providers = LanguageModelRegistry::global(cx).read(cx).providers();
-    let mut recommended_set = HashSet::default();
+
-    for provider in LanguageModelRegistry::global(cx)
+    let recommended = providers
-        .read(cx)
-        .providers()
         .iter()
-    {
+        .flat_map(|provider| {
-        let models = provider.recommended_models(cx);
-        recommended_set.extend(models.iter().map(|model| (model.provider_id(), model.id())));
-        recommended.extend(
             provider
                 .recommended_models(cx)
                 .into_iter()
-                .map(move |model| ModelInfo {
+                .map(|model| ModelInfo {
-                    model: model.clone(),
+                    model,
                     icon: provider.icon(),
-                }),
+                })
-        );
-    }
-
-    let other_models = LanguageModelRegistry::global(cx)
-        .read(cx)
-        .providers()
-        .iter()
-        .map(|provider| {
-            (
-                provider.id(),
-                provider
-                    .provided_models(cx)
-                    .into_iter()
-                    .filter_map(|model| {
-                        let not_included =
-                            !recommended_set.contains(&(model.provider_id(), model.id()));
-                        not_included.then(|| ModelInfo {
-                            model: model.clone(),
-                            icon: provider.icon(),
-                        })
-                    })
-                    .collect::<Vec<_>>(),
-            )
         })
-        .collect::<IndexMap<_, _>>();
+        .collect();
 
-    GroupedModels {
+    let other = providers
-        recommended,
+        .iter()
-        other: other_models,
+        .flat_map(|provider| {
-    }
+            provider
+                .provided_models(cx)
+                .into_iter()
+                .map(|model| ModelInfo {
+                    model,
+                    icon: provider.icon(),
+                })
+        })
+        .collect();
+
+    GroupedModels::new(other, recommended)
 }
 
 #[derive(Clone)]
@@ -234,11 +216,14 @@ struct GroupedModels {
 
 impl GroupedModels {
     pub fn new(other: Vec<ModelInfo>, recommended: Vec<ModelInfo>) -> Self {
-        let recommended_ids: HashSet<_> = recommended.iter().map(|info| info.model.id()).collect();
+        let recommended_ids = recommended
+            .iter()
+            .map(|info| (info.model.provider_id(), info.model.id()))
+            .collect::<HashSet<_>>();
 
         let mut other_by_provider: IndexMap<_, Vec<ModelInfo>> = IndexMap::default();
         for model in other {
-            if recommended_ids.contains(&model.model.id()) {
+            if recommended_ids.contains(&(model.model.provider_id(), model.model.id())) {
                 continue;
             }
 
@@ -823,4 +808,26 @@ mod tests {
         // Recommended models should not appear in "other"
         assert_models_eq(actual_other_models, vec!["zed/gemini", "copilot/o3"]);
     }
+
+    #[gpui::test]
+    fn test_dont_exclude_models_from_other_providers(_cx: &mut TestAppContext) {
+        let recommended_models = create_models(vec![("zed", "claude")]);
+        let all_models = create_models(vec![
+            ("zed", "claude"), // Should be filtered out from "other"
+            ("zed", "gemini"),
+            ("copilot", "claude"), // Should not be filtered out from "other"
+        ]);
+
+        let grouped_models = GroupedModels::new(all_models, recommended_models);
+
+        let actual_other_models = grouped_models
+            .other
+            .values()
+            .flatten()
+            .cloned()
+            .collect::<Vec<_>>();
+
+        // Recommended models should not appear in "other"
+        assert_models_eq(actual_other_models, vec!["zed/gemini", "copilot/claude"]);
+    }
 }