SSS: implement typing indications

src/api/client_server/sync/msc4186.rs

@@ -573,6 +573,28 @@ pub(crate) async fn sync_events_v5_route(
         None
     };
 
+    let typing = if body.extensions.typing.enabled == Some(true) {
+        let mut typing = BTreeMap::new();
+        for room_id in todo_rooms.keys() {
+            if services().rooms.edus.typing.last_typing_update(room_id).await?
+                > globalsince
+            {
+                let event =
+                    services().rooms.edus.typing.typings_all(room_id).await?;
+
+                let Ok(event) = Raw::new(&event) else {
+                    continue;
+                };
+                typing.insert(room_id.clone(), event);
+            }
+        }
+        Some(sync_events::v5::response::Typing {
+            rooms: typing,
+        })
+    } else {
+        None
+    };
+
     let mut rooms = BTreeMap::new();
     for (room_id, todo_room) in todo_rooms {
         if let Some(room) =
@@ -587,9 +609,7 @@ pub(crate) async fn sync_events_v5_route(
         e2ee: e2ee.unwrap_or_default(),
         account_data: account_data.unwrap_or_default(),
         receipts: receipts.unwrap_or_default(),
-        typing: sync_events::v5::response::Typing {
-            rooms: BTreeMap::new(),
-        },
+        typing: typing.unwrap_or_default(),
     };
 
     let extensions_empty = extensions