fix: Emit MsgsChanged if the number of unnoticed archived chats could decrease (#5768)

Follow-up to 3cf78749df "Emit DC_EVENT_MSGS_CHANGED for
DC_CHAT_ID_ARCHIVED_LINK when the number of archived chats with unread messages increases (#3940)".

In general we don't want to make an extra db query to know if a noticied chat is
archived. Emitting events should be cheap, better to allow false-positive `MsgsChanged` events.

src/chat.rs

@@ -3268,35 +3268,25 @@ pub async fn marknoticed_chat(context: &Context, chat_id: ChatId) -> Result<()>
             context.emit_event(EventType::MsgsNoticed(chat_id_in_archive));
             chatlist_events::emit_chatlist_item_changed(context, chat_id_in_archive);
         }
-        chatlist_events::emit_chatlist_item_changed(context, DC_CHAT_ID_ARCHIVED_LINK);
+    } else if context
-    } else {
+        .sql
-        let exists = context
+        .execute(
-            .sql
+            "UPDATE msgs
-            .exists(
+            SET state=?
-                "SELECT COUNT(*) FROM msgs WHERE state=? AND hidden=0 AND chat_id=?;",
+          WHERE state=?
-                (MessageState::InFresh, chat_id),
+            AND hidden=0
-            )
+            AND chat_id=?;",
-            .await?;
+            (MessageState::InNoticed, MessageState::InFresh, chat_id),
-        if !exists {
+        )
-            return Ok(());
+        .await?
-        }
+        == 0
-
+    {
-        context
+        return Ok(());
-            .sql
-            .execute(
-                "UPDATE msgs
-                SET state=?
-              WHERE state=?
-                AND hidden=0
-                AND chat_id=?;",
-                (MessageState::InNoticed, MessageState::InFresh, chat_id),
-            )
-            .await?;
     }
 
     context.emit_event(EventType::MsgsNoticed(chat_id));
     chatlist_events::emit_chatlist_item_changed(context, chat_id);
-
+    context.on_archived_chats_maybe_noticed();
     Ok(())
 }
 
@@ -3359,6 +3349,7 @@ pub(crate) async fn mark_old_messages_as_noticed(
             context,
             "Marking chats as noticed because there are newer outgoing messages: {changed_chats:?}."
         );
+        context.on_archived_chats_maybe_noticed();
     }
 
     for c in changed_chats {
@@ -4697,6 +4688,14 @@ impl Context {
             SyncAction::SetContacts(addrs) => set_contacts_by_addrs(self, chat_id, addrs).await,
         }
     }
+
+    /// Emits the appropriate `MsgsChanged` event. Should be called if the number of unnoticed
+    /// archived chats could decrease. In general we don't want to make an extra db query to know if
+    /// a noticied chat is archived. Emitting events should be cheap, a false-positive `MsgsChanged`
+    /// is ok.
+    pub(crate) fn on_archived_chats_maybe_noticed(&self) {
+        self.emit_msgs_changed(DC_CHAT_ID_ARCHIVED_LINK, MsgId::new(0));
+    }
 }
 
 #[cfg(test)]
@@ -5868,7 +5867,27 @@ mod tests {
         assert_eq!(DC_CHAT_ID_ARCHIVED_LINK.get_fresh_msg_cnt(&t).await?, 2);
 
         // mark one of the archived+muted chats as noticed: check that the archive-link counter is changed as well
+        t.evtracker.clear_events();
         marknoticed_chat(&t, claire_chat_id).await?;
+        let ev = t
+            .evtracker
+            .get_matching(|ev| {
+                matches!(
+                    ev,
+                    EventType::MsgsChanged {
+                        chat_id: DC_CHAT_ID_ARCHIVED_LINK,
+                        ..
+                    }
+                )
+            })
+            .await;
+        assert_eq!(
+            ev,
+            EventType::MsgsChanged {
+                chat_id: DC_CHAT_ID_ARCHIVED_LINK,
+                msg_id: MsgId::new(0),
+            }
+        );
         assert_eq!(bob_chat_id.get_fresh_msg_cnt(&t).await?, 2);
         assert_eq!(claire_chat_id.get_fresh_msg_cnt(&t).await?, 0);
         assert_eq!(DC_CHAT_ID_ARCHIVED_LINK.get_fresh_msg_cnt(&t).await?, 1);

src/imap.rs

@@ -1201,6 +1201,9 @@ impl Session {
         set_modseq(context, folder, highest_modseq)
             .await
             .with_context(|| format!("failed to set MODSEQ for folder {folder}"))?;
+        if !updated_chat_ids.is_empty() {
+            context.on_archived_chats_maybe_noticed();
+        }
         for updated_chat_id in updated_chat_ids {
             context.emit_event(EventType::MsgsNoticed(updated_chat_id));
             chatlist_events::emit_chatlist_item_changed(context, updated_chat_id);

src/message.rs

@@ -11,7 +11,7 @@ use serde::{Deserialize, Serialize};
 use tokio::{fs, io};
 
 use crate::blob::BlobObject;
-use crate::chat::{Chat, ChatId, ChatIdBlocked};
+use crate::chat::{Chat, ChatId, ChatIdBlocked, ChatVisibility};
 use crate::chatlist_events;
 use crate::config::Config;
 use crate::constants::{
@@ -1664,6 +1664,7 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
                     m.param AS param,
                     m.from_id AS from_id,
                     m.rfc724_mid AS rfc724_mid,
+                    c.archived AS archived,
                     c.blocked AS blocked
                  FROM msgs m LEFT JOIN chats c ON c.id=m.chat_id
                  WHERE m.id IN ({}) AND m.chat_id>9",
@@ -1677,16 +1678,20 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
                 let param: Params = row.get::<_, String>("param")?.parse().unwrap_or_default();
                 let from_id: ContactId = row.get("from_id")?;
                 let rfc724_mid: String = row.get("rfc724_mid")?;
+                let visibility: ChatVisibility = row.get("archived")?;
                 let blocked: Option<Blocked> = row.get("blocked")?;
                 let ephemeral_timer: EphemeralTimer = row.get("ephemeral_timer")?;
                 Ok((
-                    id,
+                    (
-                    chat_id,
+                        id,
-                    state,
+                        chat_id,
-                    param,
+                        state,
-                    from_id,
+                        param,
-                    rfc724_mid,
+                        from_id,
-                    blocked.unwrap_or_default(),
+                        rfc724_mid,
+                        visibility,
+                        blocked.unwrap_or_default(),
+                    ),
                     ephemeral_timer,
                 ))
             },
@@ -1694,25 +1699,28 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
         )
         .await?;
 
-    if msgs.iter().any(
+    if msgs
-        |(_id, _chat_id, _state, _param, _from_id, _rfc724_mid, _blocked, ephemeral_timer)| {
+        .iter()
-            *ephemeral_timer != EphemeralTimer::Disabled
+        .any(|(_, ephemeral_timer)| *ephemeral_timer != EphemeralTimer::Disabled)
-        },
+    {
-    ) {
         start_ephemeral_timers_msgids(context, &msg_ids)
             .await
             .context("failed to start ephemeral timers")?;
     }
 
     let mut updated_chat_ids = BTreeSet::new();
+    let mut archived_chats_maybe_noticed = false;
     for (
-        id,
+        (
-        curr_chat_id,
+            id,
-        curr_state,
+            curr_chat_id,
-        curr_param,
+            curr_state,
-        curr_from_id,
+            curr_param,
-        curr_rfc724_mid,
+            curr_from_id,
-        curr_blocked,
+            curr_rfc724_mid,
+            curr_visibility,
+            curr_blocked,
+        ),
         _curr_ephemeral_timer,
     ) in msgs
     {
@@ -1750,12 +1758,17 @@ pub async fn markseen_msgs(context: &Context, msg_ids: Vec<MsgId>) -> Result<()>
             }
             updated_chat_ids.insert(curr_chat_id);
         }
+        archived_chats_maybe_noticed |=
+            curr_state == MessageState::InFresh && curr_visibility == ChatVisibility::Archived;
     }
 
     for updated_chat_id in updated_chat_ids {
         context.emit_event(EventType::MsgsNoticed(updated_chat_id));
         chatlist_events::emit_chatlist_item_changed(context, updated_chat_id);
     }
+    if archived_chats_maybe_noticed {
+        context.on_archived_chats_maybe_noticed();
+    }
 
     Ok(())
 }