joining a space seemed to noop

- Should be fixed

Riot/Modules/Spaces/SpaceDetail/SpaceDetailViewModel.swift

@@ -27,6 +27,7 @@ class SpaceDetailViewModel: SpaceDetailViewModelType {
     private let session: MXSession
     private let spaceId: String
     private let publicRoom: MXPublicRoom?
+    private var spaceGraphObserver: Any?
     
     // MARK: - Setup
     
@@ -42,6 +43,12 @@ class SpaceDetailViewModel: SpaceDetailViewModelType {
         self.spaceId = publicRoom.roomId
     }
     
+    deinit {
+        if let spaceGraphObserver = spaceGraphObserver {
+            NotificationCenter.default.removeObserver(spaceGraphObserver)
+        }
+    }
+    
     // MARK: - Public
 
     func process(viewAction: SpaceDetailViewAction) {
@@ -108,7 +115,14 @@ class SpaceDetailViewModel: SpaceDetailViewModelType {
             guard let self = self else { return }
             switch response {
             case .success:
-                self.coordinatorDelegate?.spaceDetailViewModelDidJoin(self)
+                self.spaceGraphObserver = NotificationCenter.default.addObserver(forName: MXSpaceService.didBuildSpaceGraph, object: nil, queue: OperationQueue.main) { [weak self] notification in
+                    guard let self = self else { return }
+                    
+                    if let spaceGraphObserver = self.spaceGraphObserver {
+                        NotificationCenter.default.removeObserver(spaceGraphObserver)
+                    }
+                    self.coordinatorDelegate?.spaceDetailViewModelDidJoin(self)
+                }
             case .failure(let error):
                 self.update(viewState: .error(error))
             }