From 20b17e5f3dd4a842224a5e32f6f546c45384cecf Mon Sep 17 00:00:00 2001
From: ggurdin <46800240+ggurdin@users.noreply.github.com>
Date: Thu, 21 Aug 2025 11:37:08 -0400
Subject: [PATCH] fix: load full participant list when needed (#3782)

---
 lib/pages/chat/chat.dart                            |  6 ++++++
 lib/pages/chat_details/chat_details.dart            | 12 ++++++++++++
 lib/pages/chat_list/space_view.dart                 |  6 ++++++
 lib/pangea/spaces/utils/load_participants_util.dart |  1 +
 lib/utils/client_manager.dart                       |  1 -
 5 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/lib/pages/chat/chat.dart b/lib/pages/chat/chat.dart
index b5944b175..b8e277831 100644
--- a/lib/pages/chat/chat.dart
+++ b/lib/pages/chat/chat.dart
@@ -645,6 +645,12 @@ class ChatController extends State<ChatPageWithRoom>
         onInsert: onInsert,
       );
       // #Pangea
+      // Users with assosiated events in the timeline will be loaded into the state
+      // in-memory cache by getTimeline, but to ensure all users (even those without
+      // event in the timeline) are loaded, we will request all users. This is important
+      // for widgets in the chat like the activity participants displays
+      room.requestParticipants();
+
       if (visibleEvents.length < 10 && timeline != null) {
         var prevNumEvents = timeline!.events.length;
         await requestHistory();
diff --git a/lib/pages/chat_details/chat_details.dart b/lib/pages/chat_details/chat_details.dart
index 5a43aed3d..ddd1e2d91 100644
--- a/lib/pages/chat_details/chat_details.dart
+++ b/lib/pages/chat_details/chat_details.dart
@@ -50,6 +50,18 @@ class ChatDetailsController extends State<ChatDetails> {
   String? get roomId => widget.roomId;
 
   // #Pangea
+  @override
+  void initState() {
+    super.initState();
+
+    // Widgets within the chat details page rely on a fully-loaded in-memory
+    // participants list, so we need to ensure that the participants are loaded
+    final room = Matrix.of(context).client.getRoomById(widget.roomId);
+    room?.requestParticipants().then((_) {
+      if (mounted) setState(() {});
+    });
+  }
+
   final GlobalKey<ChatDetailsController> addConversationBotKey =
       GlobalKey<ChatDetailsController>();
 
diff --git a/lib/pages/chat_list/space_view.dart b/lib/pages/chat_list/space_view.dart
index 2aa967bcc..fe5c5e7db 100644
--- a/lib/pages/chat_list/space_view.dart
+++ b/lib/pages/chat_list/space_view.dart
@@ -75,6 +75,12 @@ class _SpaceViewState extends State<SpaceView> {
   void initState() {
     // #Pangea
     // loadHierarchy();
+    // load full participant list into memory to ensure widgets
+    // that rely on full participants list work as expected
+    final room = Matrix.of(context).client.getRoomById(widget.spaceId);
+    room?.requestParticipants().then((_) {
+      if (mounted) setState(() {});
+    });
 
     // If, on launch, this room has had updates to its children,
     // ensure the hierarchy is properly reloaded
diff --git a/lib/pangea/spaces/utils/load_participants_util.dart b/lib/pangea/spaces/utils/load_participants_util.dart
index 78faca705..c7c48fb46 100644
--- a/lib/pangea/spaces/utils/load_participants_util.dart
+++ b/lib/pangea/spaces/utils/load_participants_util.dart
@@ -51,6 +51,7 @@ class LoadParticipantsUtilState extends State<LoadParticipantsUtil> {
         error = null;
       });
 
+      await widget.space.requestParticipants();
       await _cacheLevels();
     } catch (err, s) {
       error = err.toString();
diff --git a/lib/utils/client_manager.dart b/lib/utils/client_manager.dart
index 9b6392b1e..c981aae82 100644
--- a/lib/utils/client_manager.dart
+++ b/lib/utils/client_manager.dart
@@ -131,7 +131,6 @@ abstract class ClientManager {
         // to postLoad to confirm that these state events are completely loaded
         EventTypes.RoomPowerLevels,
         EventTypes.RoomJoinRules,
-        EventTypes.RoomMember,
         PangeaEventTypes.rules,
         PangeaEventTypes.botOptions,
         PangeaEventTypes.capacity,