Change the way hard splits are handled.

lib/src/line_splitting/solve_state.dart

Index: lib/src/line_splitting/solve_state.dart
diff --git a/lib/src/line_splitting/solve_state.dart b/lib/src/line_splitting/solve_state.dart
index 4b58b50106fa275a92e5ca41211f9651f651df86..47489b6e4ae80278da97a853016a7b21f532d4e4 100644
--- a/lib/src/line_splitting/solve_state.dart
+++ b/lib/src/line_splitting/solve_state.dart
@@ -113,11 +113,7 @@ class SolveState {
 
   /// Gets the value to use for [rule], either the bound value or
   /// [Rule.unsplit] if it isn't bound.
-  int getValue(Rule rule) {
-    if (rule is HardSplitRule) return Rule.unsplit;
-
-    return _ruleValues.getValue(rule);
-  }
+  int getValue(Rule rule) => _ruleValues.getValue(rule);
 
   /// Returns `true` if this state is a better solution to use as the final
   /// result than [other].
@@ -437,7 +433,6 @@ class SolveState {
   /// live rules were added.
   bool _addLiveRules(Rule rule) {
     if (rule == null) return false;
-    if (rule is HardSplitRule) return false;
 
     var added = false;
     for (var constrained in rule.allConstrainedRules) {
@@ -472,7 +467,7 @@ class SolveState {
       }
 
       var rule = _splitter.chunks[i].rule;
-      if (rule != null && rule is! HardSplitRule) {
+      if (rule != null) {
         if (_ruleValues.contains(rule)) {
           boundInLine.add(rule);
         } else {