Resolve completion items once exactly (#22448)

Closes https://github.com/zed-industries/zed/issues/19214
Closes https://github.com/zed-industries/zed/pull/22443

Adds `resolved` property into Zed completion item data, to ensure we
resolve every completion item exactly once.

There are 2 paths for singplayer Zed, and corresponding 2 analogues for
multi player code, where resolve may happen:
* completions menu display & selection, that ends up using
`resolve_completions` in `lsp_store.rs`
* applying a completion menu entry, that ends up using
`apply_additional_edits_for_completion` in `lsp_store.rs`

Now, all local counterparts check `enabled` field before resolving and
set it to true afterwards, and reuse the same `resolve_completion_local`
method for resolving the items.

A logic for re-generating docs and item labels was moved out from the
`resolve_completion_local` method into a separate method, as
`apply_additional_edits_for_completion` does not need that, but needs
the rest of the logic for resolving.
During the extraction, I've noted that multiplayer clients are not
getting the item labels, regenerated after the resolve — as the Zed
protocol-based flow is not the exact copy of the local resolving.
To improve that, `resolve_completion_remote` needs to be adjusted, but
this change is omitted to avoid bloating the PR.

Release Notes:

- Fixed autocomplete inserting multiple imports

crates/assistant/src/slash_command.rs

@@ -149,6 +149,7 @@ impl SlashCommandCompletionProvider {
                             server_id: LanguageServerId(0),
                             lsp_completion: Default::default(),
                             confirm,
+                            resolved: true,
                         })
                     })
                     .collect()
@@ -242,6 +243,7 @@ impl SlashCommandCompletionProvider {
                             server_id: LanguageServerId(0),
                             lsp_completion: Default::default(),
                             confirm,
+                            resolved: true,
                         }
                     })
                     .collect())
@@ -330,16 +332,6 @@ impl CompletionProvider for SlashCommandCompletionProvider {
         Task::ready(Ok(true))
     }
 
-    fn apply_additional_edits_for_completion(
-        &self,
-        _: Model<Buffer>,
-        _: project::Completion,
-        _: bool,
-        _: &mut ViewContext<Editor>,
-    ) -> Task<Result<Option<language::Transaction>>> {
-        Task::ready(Ok(None))
-    }
-
     fn is_completion_trigger(
         &self,
         buffer: &Model<Buffer>,

crates/collab_ui/src/chat_panel/message_editor.rs

@@ -79,16 +79,6 @@ impl CompletionProvider for MessageEditorCompletionProvider {
         Task::ready(Ok(false))
     }
 
-    fn apply_additional_edits_for_completion(
-        &self,
-        _buffer: Model<Buffer>,
-        _completion: Completion,
-        _push_to_history: bool,
-        _cx: &mut ViewContext<Editor>,
-    ) -> Task<Result<Option<language::Transaction>>> {
-        Task::ready(Ok(None))
-    }
-
     fn is_completion_trigger(
         &self,
         _buffer: &Model<Buffer>,
@@ -319,6 +309,7 @@ impl MessageEditor {
                     server_id: LanguageServerId(0), // TODO: Make this optional or something?
                     lsp_completion: Default::default(), // TODO: Make this optional or something?
                     confirm: None,
+                    resolved: true,
                 }
             })
             .collect()

crates/editor/src/code_context_menus.rs

@@ -224,6 +224,7 @@ impl CompletionsMenu {
                 documentation: None,
                 lsp_completion: Default::default(),
                 confirm: None,
+                resolved: true,
             })
             .collect();
 

crates/editor/src/editor.rs

@@ -3830,8 +3830,11 @@ impl Editor {
         };
 
         let buffer_handle = completions_menu.buffer;
-        let completions = completions_menu.completions.borrow_mut();
-        let completion = completions.get(mat.candidate_id)?;
+        let completion = completions_menu
+            .completions
+            .borrow()
+            .get(mat.candidate_id)?
+            .clone();
         cx.stop_propagation();
 
         let snippet;
@@ -3975,9 +3978,11 @@ impl Editor {
         }
 
         let provider = self.completion_provider.as_ref()?;
+        drop(completion);
         let apply_edits = provider.apply_additional_edits_for_completion(
             buffer_handle,
-            completion.clone(),
+            completions_menu.completions.clone(),
+            mat.candidate_id,
             true,
             cx,
         );
@@ -5087,7 +5092,7 @@ impl Editor {
             }))
     }
 
-    #[cfg(feature = "test-support")]
+    #[cfg(any(feature = "test-support", test))]
     pub fn context_menu_visible(&self) -> bool {
         self.context_menu
             .borrow()
@@ -13447,11 +13452,14 @@ pub trait CompletionProvider {
 
     fn apply_additional_edits_for_completion(
         &self,
-        buffer: Model<Buffer>,
-        completion: Completion,
-        push_to_history: bool,
-        cx: &mut ViewContext<Editor>,
-    ) -> Task<Result<Option<language::Transaction>>>;
+        _buffer: Model<Buffer>,
+        _completions: Rc<RefCell<Box<[Completion]>>>,
+        _completion_index: usize,
+        _push_to_history: bool,
+        _cx: &mut ViewContext<Editor>,
+    ) -> Task<Result<Option<language::Transaction>>> {
+        Task::ready(Ok(None))
+    }
 
     fn is_completion_trigger(
         &self,
@@ -13610,6 +13618,7 @@ fn snippet_completions(
                 Some(Completion {
                     old_range: range,
                     new_text: snippet.body.clone(),
+                    resolved: false,
                     label: CodeLabel {
                         text: matching_prefix.clone(),
                         runs: vec![],
@@ -13675,19 +13684,30 @@ impl CompletionProvider for Model<Project> {
         cx: &mut ViewContext<Editor>,
     ) -> Task<Result<bool>> {
         self.update(cx, |project, cx| {
-            project.resolve_completions(buffer, completion_indices, completions, cx)
+            project.lsp_store().update(cx, |lsp_store, cx| {
+                lsp_store.resolve_completions(buffer, completion_indices, completions, cx)
+            })
         })
     }
 
     fn apply_additional_edits_for_completion(
         &self,
         buffer: Model<Buffer>,
-        completion: Completion,
+        completions: Rc<RefCell<Box<[Completion]>>>,
+        completion_index: usize,
         push_to_history: bool,
         cx: &mut ViewContext<Editor>,
     ) -> Task<Result<Option<language::Transaction>>> {
         self.update(cx, |project, cx| {
-            project.apply_additional_edits_for_completion(buffer, completion, push_to_history, cx)
+            project.lsp_store().update(cx, |lsp_store, cx| {
+                lsp_store.apply_additional_edits_for_completion(
+                    buffer,
+                    completions,
+                    completion_index,
+                    push_to_history,
+                    cx,
+                )
+            })
         })
     }
 

crates/editor/src/editor_tests.rs

@@ -8402,7 +8402,6 @@ async fn test_completion(cx: &mut gpui::TestAppContext) {
         additional edit
     "});
 
-    handle_resolve_completion_request(&mut cx, None).await;
     apply_additional_edits.await.unwrap();
 
     update_test_language_settings(&mut cx, |settings| {
@@ -10698,10 +10697,14 @@ async fn test_completions_resolve_updates_labels_if_filter_text_matches(
         ..lsp::CompletionItem::default()
     };
 
-    cx.handle_request::<lsp::request::Completion, _, _>(move |_, _, _| {
+    let item1 = item1.clone();
+    cx.handle_request::<lsp::request::Completion, _, _>({
         let item1 = item1.clone();
-        let item2 = item2.clone();
-        async move { Ok(Some(lsp::CompletionResponse::Array(vec![item1, item2]))) }
+        move |_, _, _| {
+            let item1 = item1.clone();
+            let item2 = item2.clone();
+            async move { Ok(Some(lsp::CompletionResponse::Array(vec![item1, item2]))) }
+        }
     })
     .next()
     .await;
@@ -10728,43 +10731,41 @@ async fn test_completions_resolve_updates_labels_if_filter_text_matches(
         }
     });
 
-    cx.handle_request::<lsp::request::ResolveCompletionItem, _, _>(move |_, _, _| async move {
-        Ok(lsp::CompletionItem {
-            label: "method id()".to_string(),
-            filter_text: Some("id".to_string()),
-            detail: Some("Now resolved!".to_string()),
-            documentation: Some(lsp::Documentation::String("Docs".to_string())),
-            text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
-                range: lsp::Range::new(lsp::Position::new(0, 22), lsp::Position::new(0, 22)),
-                new_text: ".id".to_string(),
-            })),
-            ..lsp::CompletionItem::default()
-        })
+    cx.handle_request::<lsp::request::ResolveCompletionItem, _, _>({
+        let item1 = item1.clone();
+        move |_, item_to_resolve, _| {
+            let item1 = item1.clone();
+            async move {
+                if item1 == item_to_resolve {
+                    Ok(lsp::CompletionItem {
+                        label: "method id()".to_string(),
+                        filter_text: Some("id".to_string()),
+                        detail: Some("Now resolved!".to_string()),
+                        documentation: Some(lsp::Documentation::String("Docs".to_string())),
+                        text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
+                            range: lsp::Range::new(
+                                lsp::Position::new(0, 22),
+                                lsp::Position::new(0, 22),
+                            ),
+                            new_text: ".id".to_string(),
+                        })),
+                        ..lsp::CompletionItem::default()
+                    })
+                } else {
+                    Ok(item_to_resolve)
+                }
+            }
+        }
     })
     .next()
-    .await;
+    .await
+    .unwrap();
     cx.run_until_parked();
 
     cx.update_editor(|editor, cx| {
         editor.context_menu_next(&Default::default(), cx);
     });
 
-    cx.handle_request::<lsp::request::ResolveCompletionItem, _, _>(move |_, _, _| async move {
-        Ok(lsp::CompletionItem {
-            label: "invalid changed label".to_string(),
-            detail: Some("Now resolved!".to_string()),
-            documentation: Some(lsp::Documentation::String("Docs".to_string())),
-            text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
-                range: lsp::Range::new(lsp::Position::new(0, 22), lsp::Position::new(0, 22)),
-                new_text: ".id".to_string(),
-            })),
-            ..lsp::CompletionItem::default()
-        })
-    })
-    .next()
-    .await;
-    cx.run_until_parked();
-
     cx.update_editor(|editor, _| {
         let context_menu = editor.context_menu.borrow_mut();
         let context_menu = context_menu
@@ -10787,6 +10788,172 @@ async fn test_completions_resolve_updates_labels_if_filter_text_matches(
     });
 }
 
+#[gpui::test]
+async fn test_completions_resolve_happens_once(cx: &mut gpui::TestAppContext) {
+    init_test(cx, |_| {});
+
+    let mut cx = EditorLspTestContext::new_rust(
+        lsp::ServerCapabilities {
+            completion_provider: Some(lsp::CompletionOptions {
+                trigger_characters: Some(vec![".".to_string()]),
+                resolve_provider: Some(true),
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        cx,
+    )
+    .await;
+
+    cx.set_state(indoc! {"fn main() { let a = 2ˇ; }"});
+    cx.simulate_keystroke(".");
+
+    let unresolved_item_1 = lsp::CompletionItem {
+        label: "id".to_string(),
+        filter_text: Some("id".to_string()),
+        detail: None,
+        documentation: None,
+        text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
+            range: lsp::Range::new(lsp::Position::new(0, 22), lsp::Position::new(0, 22)),
+            new_text: ".id".to_string(),
+        })),
+        ..lsp::CompletionItem::default()
+    };
+    let resolved_item_1 = lsp::CompletionItem {
+        additional_text_edits: Some(vec![lsp::TextEdit {
+            range: lsp::Range::new(lsp::Position::new(0, 20), lsp::Position::new(0, 22)),
+            new_text: "!!".to_string(),
+        }]),
+        ..unresolved_item_1.clone()
+    };
+    let unresolved_item_2 = lsp::CompletionItem {
+        label: "other".to_string(),
+        filter_text: Some("other".to_string()),
+        detail: None,
+        documentation: None,
+        text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
+            range: lsp::Range::new(lsp::Position::new(0, 22), lsp::Position::new(0, 22)),
+            new_text: ".other".to_string(),
+        })),
+        ..lsp::CompletionItem::default()
+    };
+    let resolved_item_2 = lsp::CompletionItem {
+        additional_text_edits: Some(vec![lsp::TextEdit {
+            range: lsp::Range::new(lsp::Position::new(0, 20), lsp::Position::new(0, 22)),
+            new_text: "??".to_string(),
+        }]),
+        ..unresolved_item_2.clone()
+    };
+
+    let resolve_requests_1 = Arc::new(AtomicUsize::new(0));
+    let resolve_requests_2 = Arc::new(AtomicUsize::new(0));
+    cx.lsp
+        .server
+        .on_request::<lsp::request::ResolveCompletionItem, _, _>({
+            let unresolved_item_1 = unresolved_item_1.clone();
+            let resolved_item_1 = resolved_item_1.clone();
+            let unresolved_item_2 = unresolved_item_2.clone();
+            let resolved_item_2 = resolved_item_2.clone();
+            let resolve_requests_1 = resolve_requests_1.clone();
+            let resolve_requests_2 = resolve_requests_2.clone();
+            move |unresolved_request, _| {
+                let unresolved_item_1 = unresolved_item_1.clone();
+                let resolved_item_1 = resolved_item_1.clone();
+                let unresolved_item_2 = unresolved_item_2.clone();
+                let resolved_item_2 = resolved_item_2.clone();
+                let resolve_requests_1 = resolve_requests_1.clone();
+                let resolve_requests_2 = resolve_requests_2.clone();
+                async move {
+                    if unresolved_request == unresolved_item_1 {
+                        resolve_requests_1.fetch_add(1, atomic::Ordering::Release);
+                        Ok(resolved_item_1.clone())
+                    } else if unresolved_request == unresolved_item_2 {
+                        resolve_requests_2.fetch_add(1, atomic::Ordering::Release);
+                        Ok(resolved_item_2.clone())
+                    } else {
+                        panic!("Unexpected completion item {unresolved_request:?}")
+                    }
+                }
+            }
+        })
+        .detach();
+
+    cx.handle_request::<lsp::request::Completion, _, _>(move |_, _, _| {
+        let unresolved_item_1 = unresolved_item_1.clone();
+        let unresolved_item_2 = unresolved_item_2.clone();
+        async move {
+            Ok(Some(lsp::CompletionResponse::Array(vec![
+                unresolved_item_1,
+                unresolved_item_2,
+            ])))
+        }
+    })
+    .next()
+    .await;
+
+    cx.condition(|editor, _| editor.context_menu_visible())
+        .await;
+    cx.update_editor(|editor, _| {
+        let context_menu = editor.context_menu.borrow_mut();
+        let context_menu = context_menu
+            .as_ref()
+            .expect("Should have the context menu deployed");
+        match context_menu {
+            CodeContextMenu::Completions(completions_menu) => {
+                let completions = completions_menu.completions.borrow_mut();
+                assert_eq!(
+                    completions
+                        .iter()
+                        .map(|completion| &completion.label.text)
+                        .collect::<Vec<_>>(),
+                    vec!["id", "other"]
+                )
+            }
+            CodeContextMenu::CodeActions(_) => panic!("Should show the completions menu"),
+        }
+    });
+    cx.run_until_parked();
+
+    cx.update_editor(|editor, cx| {
+        editor.context_menu_next(&ContextMenuNext, cx);
+    });
+    cx.run_until_parked();
+    cx.update_editor(|editor, cx| {
+        editor.context_menu_prev(&ContextMenuPrev, cx);
+    });
+    cx.run_until_parked();
+    cx.update_editor(|editor, cx| {
+        editor.context_menu_next(&ContextMenuNext, cx);
+    });
+    cx.run_until_parked();
+    cx.update_editor(|editor, cx| {
+        editor
+            .compose_completion(&ComposeCompletion::default(), cx)
+            .expect("No task returned")
+    })
+    .await
+    .expect("Completion failed");
+    cx.run_until_parked();
+
+    cx.update_editor(|editor, cx| {
+        assert_eq!(
+            resolve_requests_1.load(atomic::Ordering::Acquire),
+            1,
+            "Should always resolve once despite multiple selections"
+        );
+        assert_eq!(
+            resolve_requests_2.load(atomic::Ordering::Acquire),
+            1,
+            "Should always resolve once after multiple selections and applying the completion"
+        );
+        assert_eq!(
+            editor.text(cx),
+            "fn main() { let a = ??.other; }",
+            "Should use resolved data when applying the completion"
+        );
+    });
+}
+
 #[gpui::test]
 async fn test_completions_default_resolve_data_handling(cx: &mut gpui::TestAppContext) {
     init_test(cx, |_| {});
@@ -10950,15 +11117,10 @@ async fn test_completions_default_resolve_data_handling(cx: &mut gpui::TestAppCo
     // Completions that have already been resolved are skipped.
     assert_eq!(
         *resolved_items.lock(),
-        [
-            // Selected item is always resolved even if it was resolved before.
-            &items_out[items_out.len() - 1..items_out.len()],
-            &items_out[items_out.len() - 16..items_out.len() - 4]
-        ]
-        .concat()
-        .iter()
-        .cloned()
-        .collect::<Vec<lsp::CompletionItem>>()
+        items_out[items_out.len() - 16..items_out.len() - 4]
+            .iter()
+            .cloned()
+            .collect::<Vec<lsp::CompletionItem>>()
     );
     resolved_items.lock().clear();
 }

crates/project/src/lsp_command.rs

@@ -1918,6 +1918,7 @@ impl LspCommand for GetCompletions {
                     new_text,
                     server_id,
                     lsp_completion,
+                    resolved: false,
                 }
             })
             .collect())

crates/project/src/lsp_store.rs

@@ -4152,38 +4152,27 @@ impl LspStore {
             let mut did_resolve = false;
             if let Some((client, project_id)) = client {
                 for completion_index in completion_indices {
-                    let (server_id, completion) = {
-                        let completions = completions.borrow_mut();
-                        let completion = &completions[completion_index];
-                        did_resolve = true;
-                        let server_id = completion.server_id;
-                        let completion = completion.lsp_completion.clone();
+                    let server_id = completions.borrow()[completion_index].server_id;
 
-                        (server_id, completion)
-                    };
-
-                    Self::resolve_completion_remote(
+                    if Self::resolve_completion_remote(
                         project_id,
                         server_id,
                         buffer_id,
                         completions.clone(),
                         completion_index,
-                        completion,
                         client.clone(),
                         language_registry.clone(),
                     )
-                    .await;
+                    .await
+                    .log_err()
+                    .is_some()
+                    {
+                        did_resolve = true;
+                    }
                 }
             } else {
                 for completion_index in completion_indices {
-                    let (server_id, completion) = {
-                        let completions = completions.borrow_mut();
-                        let completion = &completions[completion_index];
-                        let server_id = completion.server_id;
-                        let completion = completion.lsp_completion.clone();
-
-                        (server_id, completion)
-                    };
+                    let server_id = completions.borrow()[completion_index].server_id;
 
                     let server_and_adapter = this
                         .read_with(&cx, |lsp_store, _| {
@@ -4198,17 +4187,27 @@ impl LspStore {
                         continue;
                     };
 
-                    did_resolve = true;
-                    Self::resolve_completion_local(
+                    let resolved = Self::resolve_completion_local(
                         server,
-                        adapter,
                         &buffer_snapshot,
                         completions.clone(),
                         completion_index,
-                        completion,
-                        language_registry.clone(),
                     )
-                    .await;
+                    .await
+                    .log_err()
+                    .is_some();
+                    if resolved {
+                        Self::regenerate_completion_labels(
+                            adapter,
+                            &buffer_snapshot,
+                            completions.clone(),
+                            completion_index,
+                            language_registry.clone(),
+                        )
+                        .await
+                        .log_err();
+                        did_resolve = true;
+                    }
                 }
             }
 
@@ -4218,13 +4217,10 @@ impl LspStore {
 
     async fn resolve_completion_local(
         server: Arc<lsp::LanguageServer>,
-        adapter: Arc<CachedLspAdapter>,
         snapshot: &BufferSnapshot,
         completions: Rc<RefCell<Box<[Completion]>>>,
         completion_index: usize,
-        completion: lsp::CompletionItem,
-        language_registry: Arc<LanguageRegistry>,
-    ) {
+    ) -> Result<()> {
         let can_resolve = server
             .capabilities()
             .completion_provider
@@ -4232,30 +4228,17 @@ impl LspStore {
             .and_then(|options| options.resolve_provider)
             .unwrap_or(false);
         if !can_resolve {
-            return;
+            return Ok(());
         }
 
-        let request = server.request::<lsp::request::ResolveCompletionItem>(completion);
-        let Some(completion_item) = request.await.log_err() else {
-            return;
+        let request = {
+            let completion = &completions.borrow()[completion_index];
+            if completion.resolved {
+                return Ok(());
+            }
+            server.request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion.clone())
         };
-
-        if let Some(lsp_documentation) = completion_item.documentation.as_ref() {
-            let documentation = language::prepare_completion_documentation(
-                lsp_documentation,
-                &language_registry,
-                snapshot.language().cloned(),
-            )
-            .await;
-
-            let mut completions = completions.borrow_mut();
-            let completion = &mut completions[completion_index];
-            completion.documentation = Some(documentation);
-        } else {
-            let mut completions = completions.borrow_mut();
-            let completion = &mut completions[completion_index];
-            completion.documentation = Some(Documentation::Undocumented);
-        }
+        let completion_item = request.await?;
 
         if let Some(text_edit) = completion_item.text_edit.as_ref() {
             // Technically we don't have to parse the whole `text_edit`, since the only
@@ -4283,28 +4266,61 @@ impl LspStore {
             }
         }
 
+        let mut completions = completions.borrow_mut();
+        let completion = &mut completions[completion_index];
+        completion.lsp_completion = completion_item;
+        completion.resolved = true;
+        Ok(())
+    }
+
+    async fn regenerate_completion_labels(
+        adapter: Arc<CachedLspAdapter>,
+        snapshot: &BufferSnapshot,
+        completions: Rc<RefCell<Box<[Completion]>>>,
+        completion_index: usize,
+        language_registry: Arc<LanguageRegistry>,
+    ) -> Result<()> {
+        let completion_item = completions.borrow()[completion_index]
+            .lsp_completion
+            .clone();
+        if let Some(lsp_documentation) = completion_item.documentation.as_ref() {
+            let documentation = language::prepare_completion_documentation(
+                lsp_documentation,
+                &language_registry,
+                snapshot.language().cloned(),
+            )
+            .await;
+
+            let mut completions = completions.borrow_mut();
+            let completion = &mut completions[completion_index];
+            completion.documentation = Some(documentation);
+        } else {
+            let mut completions = completions.borrow_mut();
+            let completion = &mut completions[completion_index];
+            completion.documentation = Some(Documentation::Undocumented);
+        }
+
         // NB: Zed does not have `details` inside the completion resolve capabilities, but certain language servers violate the spec and do not return `details` immediately, e.g. https://github.com/yioneko/vtsls/issues/213
         // So we have to update the label here anyway...
         let new_label = match snapshot.language() {
-            Some(language) => adapter
-                .labels_for_completions(&[completion_item.clone()], language)
-                .await
-                .log_err()
-                .unwrap_or_default(),
+            Some(language) => {
+                adapter
+                    .labels_for_completions(&[completion_item.clone()], language)
+                    .await?
+            }
             None => Vec::new(),
         }
         .pop()
         .flatten()
         .unwrap_or_else(|| {
             CodeLabel::plain(
-                completion_item.label.clone(),
+                completion_item.label,
                 completion_item.filter_text.as_deref(),
             )
         });
 
         let mut completions = completions.borrow_mut();
         let completion = &mut completions[completion_index];
-        completion.lsp_completion = completion_item;
         if completion.label.filter_text() == new_label.filter_text() {
             completion.label = new_label;
         } else {
@@ -4317,6 +4333,8 @@ impl LspStore {
                 new_label.filter_text()
             );
         }
+
+        Ok(())
     }
 
     #[allow(clippy::too_many_arguments)]
@@ -4326,29 +4344,30 @@ impl LspStore {
         buffer_id: BufferId,
         completions: Rc<RefCell<Box<[Completion]>>>,
         completion_index: usize,
-        completion: lsp::CompletionItem,
         client: AnyProtoClient,
         language_registry: Arc<LanguageRegistry>,
-    ) {
+    ) -> Result<()> {
+        let lsp_completion = {
+            let completion = &completions.borrow()[completion_index];
+            if completion.resolved {
+                return Ok(());
+            }
+            serde_json::to_string(&completion.lsp_completion)
+                .unwrap()
+                .into_bytes()
+        };
         let request = proto::ResolveCompletionDocumentation {
             project_id,
             language_server_id: server_id.0 as u64,
-            lsp_completion: serde_json::to_string(&completion).unwrap().into_bytes(),
+            lsp_completion,
             buffer_id: buffer_id.into(),
         };
 
-        let Some(response) = client
+        let response = client
             .request(request)
             .await
-            .context("completion documentation resolve proto request")
-            .log_err()
-        else {
-            return;
-        };
-        let Some(lsp_completion) = serde_json::from_slice(&response.lsp_completion).log_err()
-        else {
-            return;
-        };
+            .context("completion documentation resolve proto request")?;
+        let lsp_completion = serde_json::from_slice(&response.lsp_completion)?;
 
         let documentation = if response.documentation.is_empty() {
             Documentation::Undocumented
@@ -4366,6 +4385,7 @@ impl LspStore {
         let completion = &mut completions[completion_index];
         completion.documentation = Some(documentation);
         completion.lsp_completion = lsp_completion;
+        completion.resolved = true;
 
         let old_range = response
             .old_start
@@ -4377,12 +4397,15 @@ impl LspStore {
                 completion.old_range = old_start..old_end;
             }
         }
+
+        Ok(())
     }
 
     pub fn apply_additional_edits_for_completion(
         &self,
         buffer_handle: Model<Buffer>,
-        completion: Completion,
+        completions: Rc<RefCell<Box<[Completion]>>>,
+        completion_index: usize,
         push_to_history: bool,
         cx: &mut ModelContext<Self>,
     ) -> Task<Result<Option<Transaction>>> {
@@ -4391,8 +4414,9 @@ impl LspStore {
 
         if let Some((client, project_id)) = self.upstream_client() {
             cx.spawn(move |_, mut cx| async move {
-                let response = client
-                    .request(proto::ApplyCompletionAdditionalEdits {
+                let request = {
+                    let completion = completions.borrow()[completion_index].clone();
+                    proto::ApplyCompletionAdditionalEdits {
                         project_id,
                         buffer_id: buffer_id.into(),
                         completion: Some(Self::serialize_completion(&CoreCompletion {
@@ -4400,9 +4424,13 @@ impl LspStore {
                             new_text: completion.new_text,
                             server_id: completion.server_id,
                             lsp_completion: completion.lsp_completion,
+                            resolved: completion.resolved,
                         })),
-                    })
-                    .await?;
+                    }
+                };
+
+                let response = client.request(request).await?;
+                completions.borrow_mut()[completion_index].resolved = true;
 
                 if let Some(transaction) = response.transaction {
                     let transaction = language::proto::deserialize_transaction(transaction)?;
@@ -4422,34 +4450,31 @@ impl LspStore {
                 }
             })
         } else {
-            let server_id = completion.server_id;
-            let lang_server = match self.language_server_for_local_buffer(buffer, server_id, cx) {
+            let server_id = completions.borrow()[completion_index].server_id;
+            let server = match self.language_server_for_local_buffer(buffer, server_id, cx) {
                 Some((_, server)) => server.clone(),
-                _ => return Task::ready(Ok(Default::default())),
+                _ => return Task::ready(Ok(None)),
             };
+            let snapshot = buffer_handle.read(&cx).snapshot();
 
             cx.spawn(move |this, mut cx| async move {
-                let can_resolve = lang_server
-                    .capabilities()
-                    .completion_provider
-                    .as_ref()
-                    .and_then(|options| options.resolve_provider)
-                    .unwrap_or(false);
-                let additional_text_edits = if can_resolve {
-                    lang_server
-                        .request::<lsp::request::ResolveCompletionItem>(completion.lsp_completion)
-                        .await?
-                        .additional_text_edits
-                } else {
-                    completion.lsp_completion.additional_text_edits
-                };
+                Self::resolve_completion_local(
+                    server.clone(),
+                    &snapshot,
+                    completions.clone(),
+                    completion_index,
+                )
+                .await
+                .context("resolving completion")?;
+                let completion = completions.borrow()[completion_index].clone();
+                let additional_text_edits = completion.lsp_completion.additional_text_edits;
                 if let Some(edits) = additional_text_edits {
                     let edits = this
                         .update(&mut cx, |this, cx| {
                             this.as_local_mut().unwrap().edits_from_lsp(
                                 &buffer_handle,
                                 edits,
-                                lang_server.server_id(),
+                                server.server_id(),
                                 None,
                                 cx,
                             )
@@ -6803,7 +6828,7 @@ impl LspStore {
         let apply_additional_edits = this.update(&mut cx, |this, cx| {
             this.apply_additional_edits_for_completion(
                 buffer,
-                Completion {
+                Rc::new(RefCell::new(Box::new([Completion {
                     old_range: completion.old_range,
                     new_text: completion.new_text,
                     lsp_completion: completion.lsp_completion,
@@ -6815,7 +6840,9 @@ impl LspStore {
                         filter_range: Default::default(),
                     },
                     confirm: None,
-                },
+                    resolved: completion.resolved,
+                }]))),
+                0,
                 false,
                 cx,
             )
@@ -7780,6 +7807,7 @@ impl LspStore {
             new_text: completion.new_text.clone(),
             server_id: completion.server_id.0 as u64,
             lsp_completion: serde_json::to_vec(&completion.lsp_completion).unwrap(),
+            resolved: completion.resolved,
         }
     }
 
@@ -7799,6 +7827,7 @@ impl LspStore {
             new_text: completion.new_text,
             server_id: LanguageServerId(completion.server_id as usize),
             lsp_completion,
+            resolved: completion.resolved,
         })
     }
 
@@ -7900,6 +7929,7 @@ async fn populate_labels_for_completions(
             documentation,
             lsp_completion,
             confirm: None,
+            resolved: false,
         })
     }
 }

crates/project/src/project.rs

@@ -73,10 +73,8 @@ use snippet::Snippet;
 use snippet_provider::SnippetProvider;
 use std::{
     borrow::Cow,
-    cell::RefCell,
     ops::Range,
     path::{Component, Path, PathBuf},
-    rc::Rc,
     str,
     sync::Arc,
     time::Duration,
@@ -353,6 +351,8 @@ pub struct Completion {
     pub documentation: Option<Documentation>,
     /// The raw completion provided by the language server.
     pub lsp_completion: lsp::CompletionItem,
+    /// Whether this completion has been resolved, to ensure it happens once per completion.
+    pub resolved: bool,
     /// An optional callback to invoke when this completion is confirmed.
     /// Returns, whether new completions should be retriggered after the current one.
     /// If `true` is returned, the editor will show a new completion menu after this completion is confirmed.
@@ -380,6 +380,7 @@ pub(crate) struct CoreCompletion {
     new_text: String,
     server_id: LanguageServerId,
     lsp_completion: lsp::CompletionItem,
+    resolved: bool,
 }
 
 /// A code action provided by a language server.
@@ -2863,35 +2864,6 @@ impl Project {
         })
     }
 
-    pub fn resolve_completions(
-        &self,
-        buffer: Model<Buffer>,
-        completion_indices: Vec<usize>,
-        completions: Rc<RefCell<Box<[Completion]>>>,
-        cx: &mut ModelContext<Self>,
-    ) -> Task<Result<bool>> {
-        self.lsp_store.update(cx, |lsp_store, cx| {
-            lsp_store.resolve_completions(buffer, completion_indices, completions, cx)
-        })
-    }
-
-    pub fn apply_additional_edits_for_completion(
-        &self,
-        buffer_handle: Model<Buffer>,
-        completion: Completion,
-        push_to_history: bool,
-        cx: &mut ModelContext<Self>,
-    ) -> Task<Result<Option<Transaction>>> {
-        self.lsp_store.update(cx, |lsp_store, cx| {
-            lsp_store.apply_additional_edits_for_completion(
-                buffer_handle,
-                completion,
-                push_to_history,
-                cx,
-            )
-        })
-    }
-
     pub fn code_actions<T: Clone + ToOffset>(
         &mut self,
         buffer_handle: &Model<Buffer>,

crates/proto/proto/zed.proto

@@ -927,6 +927,7 @@ message Completion {
     string new_text = 3;
     uint64 server_id = 4;
     bytes lsp_completion = 5;
+    bool resolved = 6;
 }
 
 message GetCodeActions {