Remove deduplication from add_or_lookup_contacts_by_address_list

src/receive_imf.rs

@@ -2961,15 +2961,12 @@ pub(crate) async fn get_prefetch_parent_message(
 }
 
 /// Looks up contact IDs from the database given the list of recipients.
-///
-/// Returns vector of IDs guaranteed to be unique.
 async fn add_or_lookup_contacts_by_address_list(
     context: &Context,
     address_list: &[SingleInfo],
     origin: Origin,
 ) -> Result<Vec<ContactId>> {
     let mut contact_ids = Vec::new();
-    let mut contact_ids_set = HashSet::new();
     for info in address_list {
         let addr = &info.addr;
         if !may_be_valid_addr(addr) {
@@ -2980,10 +2977,7 @@ async fn add_or_lookup_contacts_by_address_list(
             let (contact_id, _) =
                 Contact::add_or_lookup(context, display_name.unwrap_or_default(), &addr, origin)
                     .await?;
-            if !contact_ids_set.contains(&contact_id) {
-                contact_ids.push(contact_id);
-                contact_ids_set.insert(contact_id);
-            }
+            contact_ids.push(contact_id);
         } else {
             warn!(context, "Contact with address {:?} cannot exist.", addr);
         }