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,

src/mimeparser.rs

@@ -770,6 +770,15 @@ impl MimeMessage {
         Ok(())
     }
 
+    /// Set different sender name for a message.
+    /// This overrides the name set by the `set_config()`-option `displayname`.
+    pub fn set_override_sender_name(&mut self, name: Option<String>) {
+        self.parts.iter_mut().for_each(|part| {
+            part.param
+                .set_optional(Param::OverrideSenderDisplayname, name.clone());
+        });
+    }
+
     async fn avatar_action_from_header(
         &mut self,
         context: &Context,

src/receive_imf.rs

@@ -1807,6 +1807,14 @@ async fn lookup_chat_by_reply(
     // If this was a private message just to self, it was probably a private reply.
     // It should not go into the group then, but into the private chat.
     if is_probably_private_reply(context, to_ids, from_id, mime_parser, parent_chat.id).await? {
+        // If the parent chat is a 1:1 chat, then the message should go to the 1:1 chat.
+        if to_ids.len() == 1 {
+            let name = chat::get_other_chat_contacts(context, parent_chat_id).await?[0];
+            if from_id != *name {
+                mime_parser.set_override_sender_name(Some(name.get_stock_name(context).await));
+            }
+            return Ok(Some((parent_chat.id, parent_chat.blocked)));
+        }
         return Ok(None);
     }
 

src/stock_str.rs

@@ -542,7 +542,7 @@ impl ContactId {
     }
 
     /// Get contact name, e.g. `Bob`, or `bob@exmple.net` if no name is set.
-    async fn get_stock_name(self, context: &Context) -> String {
+    pub async fn get_stock_name(self, context: &Context) -> String {
         Contact::get_by_id(context, self)
             .await
             .map(|contact| contact.get_display_name().to_string())