The navbar buttons were not properly displayed.

Vector/ViewController/RoomSettingsViewController.m

@@ -81,8 +81,6 @@
 {
     [super viewWillAppear:animated];
     
-    [self addDoneButton];
-    
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didMXSessionStateChange:) name:kMXSessionStateDidChangeNotification object:nil];
 }
 
@@ -94,6 +92,13 @@
     [[NSNotificationCenter defaultCenter] removeObserver:self name:kMXSessionStateDidChangeNotification object:nil];
 }
 
+// this method is called when the viewcontroller is displayed inside another one.
+- (void)didMoveToParentViewController:(nullable UIViewController *)parent
+{
+    [super didMoveToParentViewController:parent];
+    [self addDoneButton];
+}
+
 - (void)destroy
 {
     self.navigationItem.rightBarButtonItem.enabled = NO;