Change the way hard splits are handled.

lib/src/rule/combinator.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart_style.src.rule.combinator;
 
 import '../chunk.dart';
 import 'rule.dart';
 
 /// Handles a list of "combinators".
@@ skipping 62 matching lines @@
   void addCombinator(Chunk chunk) {
     _combinators.add(chunk);
     _names.add(new Set());
   }
 
   /// Adds a chunk prior to a name to the current combinator.
   void addName(Chunk chunk) {
     _names.last.add(chunk);
   }
 
-  bool isSplit(int value, Chunk chunk) {
+  bool isSplitAtValue(int value, Chunk chunk) {
     switch (value) {
-      case Rule.unsplit:
-        // Don't split at all.
-        return false;
-
       case 1:
         // Just split at the combinators.
         return _combinators.contains(chunk);
 
       case 2:
         // Split at the combinators and the first set of names.
         return _isCombinatorSplit(0, chunk);
 
       case 3:
         // If there is two combinators, just split at the combinators and the
         // second set of names.
         if (_names.length == 2) {
           // Two sets of combinators, so just split at the combinators and the
           // second set of names.
           return _isCombinatorSplit(1, chunk);
         }
 
         // Split everything.
         return true;
 
-      case 4:
+      default:
         return true;
     }
-
-    throw "unreachable";
   }
 
   /// Returns `true` if [chunk] is for a combinator or a name in the
   /// combinator at index [combinator].
   bool _isCombinatorSplit(int combinator, Chunk chunk) {
     return _combinators.contains(chunk) || _names[combinator].contains(chunk);
   }
 
   String toString() => "Comb${super.toString()}";
 }