Merge #5327

5327: Mark fixes from check as preferred r=matklad a=kjeremy

This allows us to run the auto fix command from vscode to automatically fix diagnostics in the file.

They are also distinguished in the UI.

Co-authored-by: Jeremy Kolb <kjeremy@gmail.com>

crates/rust-analyzer/src/to_proto.rs

@@ -689,6 +689,7 @@ pub(crate) fn unresolved_code_action(
         group: assist.group.filter(|_| snap.config.client_caps.code_action_group).map(|gr| gr.0),
         kind: Some(code_action_kind(assist.id.1)),
         edit: None,
+        is_preferred: None,
     };
     Ok(res)
 }