Avoid a user to appear in its own friends list

lib/ui/screens/other_friends_lists_screen.dart

@@ -30,11 +30,12 @@ class _OtherUserFriendsListScreenState
   final FriendsHelper friendsHelper = FriendsHelper();
   final UsersHelper usersHelper = UsersHelper();
 
-  UsersList _list;
+  Set<int> _friendsList;
+  UsersList _usersInfo;
   bool _error = false;
 
   String get _routeName => tr("Friends of %name%",
-      args: {"name": _list.getUser(widget.userID).displayName});
+      args: {"name": _usersInfo.getUser(widget.userID).displayName});
 
   void setError(bool e) => setState(() => _error = e);
 
@@ -49,12 +50,15 @@ class _OtherUserFriendsListScreenState
     setError(false);
 
     try {
-      final list = await usersHelper
-          .getListWithThrow(await friendsHelper.getOtherUserList(widget.userID)
-            ..add(widget.userID));
+      final friendsList = await friendsHelper.getOtherUserList(widget.userID);
+
+      // We use [Set.toSet] here to avoid the current user to appear in the list
+      final users = await usersHelper
+          .getListWithThrow(friendsList.toSet()..add(widget.userID));
 
       setState(() {
-        _list = list;
+        _friendsList = friendsList;
+        _usersInfo = users;
       });
     } catch (e, st) {
       print(e);
@@ -67,16 +71,16 @@ class _OtherUserFriendsListScreenState
   Widget build(BuildContext context) {
     if (_error) return _buildError();
 
-    if (_list == null) return buildCenteredProgressBar();
+    if (_usersInfo == null) return buildCenteredProgressBar();
 
     return Scaffold(
       appBar: AppBar(
         title: Text(_routeName),
       ),
       body: ListView.builder(
-        itemCount: _list.length,
+        itemCount: _friendsList.length,
         itemBuilder: (c, i) => SimpleUserTile(
-          user: _list[i],
+          user: _usersInfo.getUser(_friendsList.elementAt(i)),
           onTap: (u) => openUserPage(
             context: context,
             userID: u.id,