Allow splitting in redirecting constructors.

lib/src/source_visitor.dart

 // Copyright (c) 2014, 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.source_visitor;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/source.dart';
 
@@ skipping 520 matching lines @@
     modifier(node.factoryKeyword);
     visit(node.returnType);
     token(node.period);
     visit(node.name);
 
     // Make the rule for the ":" span both the preceding parameter list and
     // the entire initialization list. This ensures that we split before the
     // ":" if the parameters and initialization list don't all fit on one line.
     builder.startRule();
 
+    // If the redirecting constructor happens to wrap, we want to make sure
+    // the parameter list gets more deeply indented.
+    if (node.redirectedConstructor != null) builder.nestExpression();
+
     _visitBody(node.parameters, node.body, () {
       // Check for redirects or initializer lists.
       if (node.redirectedConstructor != null) {
         _visitConstructorRedirects(node);
+        builder.unnest();
       } else if (node.initializers.isNotEmpty) {
         _visitConstructorInitializers(node);
       }
     });
   }
 
   void _visitConstructorRedirects(ConstructorDeclaration node) {
-    token(node.separator /* = */, before: space, after: space);
+    token(node.separator /* = */, before: space);
+    soloSplit();
     visitCommaSeparatedNodes(node.initializers);
     visit(node.redirectedConstructor);
   }
 
   void _visitConstructorInitializers(ConstructorDeclaration node) {
     // Shift the ":" forward.
     builder.indent(Indent.constructorInitializer);
 
     split();
     token(node.separator); // ":".
@@ skipping 1777 matching lines @@
   /// Gets the 1-based line number that the beginning of [token] lies on.
   int _startLine(Token token) => _lineInfo.getLocation(token.offset).lineNumber;
 
   /// Gets the 1-based line number that the end of [token] lies on.
   int _endLine(Token token) => _lineInfo.getLocation(token.end).lineNumber;
 
   /// Gets the 1-based column number that the beginning of [token] lies on.
   int _startColumn(Token token) =>
       _lineInfo.getLocation(token.offset).columnNumber;
 }