add alias handling

src/chat.rs

@@ -3481,6 +3481,29 @@ pub async fn get_chat_contacts(context: &Context, chat_id: ChatId) -> Result<Vec
     Ok(list)
 }
 
+/// Returns a vector of contact IDs for given chat ID where the contact is not SELF.
+pub async fn get_other_chat_contacts(context: &Context, chat_id: ChatId) -> Result<Vec<ContactId>> {
+    // Normal chats do not include SELF.  Group chats do (as it may happen that one is deleted from a
+    // groupchat but the chats stays visible, moreover, this makes displaying lists easier)
+
+    let list = context
+        .sql
+        .query_map(
+            "SELECT cc.contact_id
+               FROM chats_contacts cc
+               LEFT JOIN contacts c
+                      ON c.id=cc.contact_id
+              WHERE cc.chat_id=? AND c.id!=1
+              ORDER BY c.id=1, c.last_seen DESC, c.id DESC;",
+            (chat_id,),
+            |row| row.get::<_, ContactId>(0),
+            |ids| ids.collect::<Result<Vec<_>, _>>().map_err(Into::into),
+        )
+        .await?;
+
+    Ok(list)
+}
+
 /// Creates a group chat with a given `name`.
 pub async fn create_group_chat(
     context: &Context,