fix: markseen_msgs(): Mark reactions to specified messages as seen too (#7884)

This allows to remove notifications for reactions from other devices. NB: UIs should pass all
messages to markseen_msgs(), incl. outgoing ones. markseen_msgs() should be called when a message
comes into view or when a reaction for a message being in view arrives.

Also don't emit `MsgsNoticed` from receive_imf_inner() if the chat still contains fresh hidden
messages, i.e. include reactions into this logic, to avoid removing notifications for reactions
until they are seen on another device.

src/sql/migrations.rs

@@ -2343,6 +2343,15 @@ ALTER TABLE contacts ADD COLUMN name_normalized TEXT;
         .await?;
     }
 
+    inc_and_check(&mut migration_version, 149)?;
+    if dbversion < migration_version {
+        sql.execute_migration(
+            "CREATE INDEX msgs_index10 ON msgs (mime_in_reply_to)",
+            migration_version,
+        )
+        .await?;
+    }
+
     let new_version = sql
         .get_raw_config_int(VERSION_CFG)
         .await?