TF-2644 Handle total size exceeded maximum size when drag & drop multiple file to composer

core/lib/core.dart

@@ -45,6 +45,7 @@ export 'utils/file_utils.dart';
 export 'utils/option_param_mixin.dart';
 export 'utils/print_utils.dart';
 export 'utils/broadcast_channel/broadcast_channel.dart';
+export 'utils/list_utils.dart';
 
 // Views
 export 'presentation/views/text/slogan_builder.dart';

core/lib/utils/list_utils.dart

@@ -0,0 +1,16 @@
+import 'package:dartz/dartz.dart';
+
+Tuple2<List<T>, List<T>> partition<T>(List<T> list, bool Function(T) predicate) {
+ List<T> trueList = [];
+ List<T> falseList = [];
+
+ for (var element in list) {
+  if (predicate(element)) {
+   trueList.add(element);
+  } else {
+   falseList.add(element);
+  }
+ }
+
+ return Tuple2(trueList, falseList);
+}