Ignore source code actions for a notebook cell (#16154)

## Summary

Related to https://github.com/astral-sh/ruff-vscode/pull/686, this PR
ignores handling source code actions for notebooks which are not
prefixed with `notebook`.

The main motivation is that the native server does not actually handle
it well which results in gibberish code. There's some context about this
in
https://github.com/astral-sh/ruff-vscode/issues/680#issuecomment-2647490812
and the following comments.

closes: https://github.com/astral-sh/ruff-vscode/issues/680

## Test Plan

Running a notebook with the following does nothing except log the
message:
```json
  "notebook.codeActionsOnSave": {
    "source.organizeImports.ruff": "explicit",
  },
```

while, including the `notebook` code actions does make the edit (as
usual):
```json
  "notebook.codeActionsOnSave": {
    "notebook.source.organizeImports.ruff": "explicit"
  },
```

crates/ruff_server/src/server/api/requests/code_action.rs

@@ -48,7 +48,15 @@ impl super::BackgroundDocumentRequestHandler for CodeActions {
 
         if snapshot.client_settings().fix_all() {
             if supported_code_actions.contains(&SupportedCodeAction::SourceFixAll) {
-                response.push(fix_all(&snapshot).with_failure_code(ErrorCode::InternalError)?);
+                if snapshot.is_notebook_cell() {
+                    // This is ignore here because the client requests this code action for each
+                    // cell in parallel and the server would send a workspace edit with the same
+                    // content which would result in applying the same edit multiple times
+                    // resulting in (possibly) duplicate code.
+                    tracing::debug!("Ignoring `source.fixAll` code action for a notebook cell");
+                } else {
+                    response.push(fix_all(&snapshot).with_failure_code(ErrorCode::InternalError)?);
+                }
             } else if supported_code_actions.contains(&SupportedCodeAction::NotebookSourceFixAll) {
                 response
                     .push(notebook_fix_all(&snapshot).with_failure_code(ErrorCode::InternalError)?);
@@ -57,8 +65,19 @@ impl super::BackgroundDocumentRequestHandler for CodeActions {
 
         if snapshot.client_settings().organize_imports() {
             if supported_code_actions.contains(&SupportedCodeAction::SourceOrganizeImports) {
-                response
-                    .push(organize_imports(&snapshot).with_failure_code(ErrorCode::InternalError)?);
+                if snapshot.is_notebook_cell() {
+                    // This is ignore here because the client requests this code action for each
+                    // cell in parallel and the server would send a workspace edit with the same
+                    // content which would result in applying the same edit multiple times
+                    // resulting in (possibly) duplicate code.
+                    tracing::debug!(
+                        "Ignoring `source.organizeImports` code action for a notebook cell"
+                    );
+                } else {
+                    response.push(
+                        organize_imports(&snapshot).with_failure_code(ErrorCode::InternalError)?,
+                    );
+                }
             } else if supported_code_actions
                 .contains(&SupportedCodeAction::NotebookSourceOrganizeImports)
             {

crates/ruff_server/src/server/api/requests/code_action_resolve.rs

@@ -50,6 +50,21 @@ impl super::BackgroundDocumentRequestHandler for CodeActionResolve {
             .with_failure_code(ErrorCode::InvalidParams);
         };
 
+        match action_kind {
+            SupportedCodeAction::SourceFixAll | SupportedCodeAction::SourceOrganizeImports
+                if snapshot.is_notebook_cell() =>
+            {
+                // This should never occur because we ignore generating these code actions for a
+                // notebook cell in the `textDocument/codeAction` request handler.
+                return Err(anyhow::anyhow!(
+                    "Code action resolver cannot resolve {:?} for a notebook cell",
+                    action_kind.to_kind().as_str()
+                ))
+                .with_failure_code(ErrorCode::InvalidParams);
+            }
+            _ => {}
+        }
+
         action.edit = match action_kind {
             SupportedCodeAction::SourceFixAll | SupportedCodeAction::NotebookSourceFixAll => Some(
                 resolve_edit_for_fix_all(

crates/ruff_server/src/session.rs

@@ -184,4 +184,15 @@ impl DocumentSnapshot {
     pub(crate) fn encoding(&self) -> PositionEncoding {
         self.position_encoding
     }
+
+    /// Returns `true` if this snapshot represents a notebook cell.
+    pub(crate) const fn is_notebook_cell(&self) -> bool {
+        matches!(
+            &self.document_ref,
+            index::DocumentQuery::Notebook {
+                cell_url: Some(_),
+                ..
+            }
+        )
+    }
 }