Load all room members when showing a room to user

src/backend/matrix_client.py

@@ -740,6 +740,13 @@ class MatrixClient(nio.AsyncClient):
             )
 
 
+    async def load_all_room_members(self, room_id: str) -> None:
+        room = self.all_rooms[room_id]
+
+        if not room.members_synced:
+            await super().joined_members(room_id)
+
+
     async def load_past_events(self, room_id: str) -> bool:
         """Ask the server for 100 previous events of the room.
 

src/gui/Pages/Chat/ChatPage.qml

@@ -13,9 +13,11 @@ HColumnPage {
     rightPadding: 0
 
     onLoadEventListChanged: if (loadEventList) loadedOnce = true
+    Component.onDestruction: if (loadMembersFuture) loadMembersFuture.cancel()
 
 
     property bool loadedOnce: false
+    property var loadMembersFuture: null
 
     readonly property alias composer: composer
     readonly property bool loadEventList:
@@ -23,6 +25,17 @@ HColumnPage {
         ! mainUI.mainPane.visible : ! pageLoader.appearAnimation.running
 
 
+    Timer {
+        interval: 200
+        running: true
+        onTriggered: loadMembersFuture = py.callClientCoro(
+            chat.userId,
+            "load_all_room_members",
+            [chat.roomId],
+            () => { loadMembersFuture = null },
+        )
+    }
+
     RoomHeader {
         Layout.fillWidth: true
     }