Tweaks for long formal parameters and method body '{' formatting.

pkg/analyzer/lib/src/services/formatter_impl.dart

 // Copyright (c) 2013, 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 formatter_impl;
 
 import 'dart:math';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/parser.dart';
@@ skipping 790 matching lines @@
   }
 
   visitFormalParameterList(FormalParameterList node) {
     var groupEnd = null;
     token(node.leftParenthesis);
     var parameters = node.parameters;
     var size = parameters.length;
     for (var i = 0; i < size; i++) {
       var parameter = parameters[i];
       if (i > 0) {
-        append(', ');
+        append(',');
+        space();
       }
       if (groupEnd == null && parameter is DefaultFormalParameter) {
         if (identical(parameter.kind, ParameterKind.NAMED)) {
           groupEnd = '}';
           append('{');
         } else {
           groupEnd = ']';
           append('[');
         }
       }
@@ skipping 232 matching lines @@
     visitMemberMetadata(node.metadata);
     modifier(node.externalKeyword);
     modifier(node.modifierKeyword);
     visitNode(node.returnType, followedBy: space);
     modifier(node.propertyKeyword);
     modifier(node.operatorKeyword);
     visit(node.name);
     if (!node.isGetter) {
       visit(node.parameters);
     }
-    visitPrefixedBody(space, node.body);
+    visitPrefixedBody(nonBreakingSpace, node.body);
   }
 
   visitMethodInvocation(MethodInvocation node) {
     visit(node.target);
     token(node.period);
     visit(node.methodName);
     visit(node.argumentList);
   }
 
   visitNamedExpression(NamedExpression node) {
@@ skipping 98 matching lines @@
 
   visitShowCombinator(ShowCombinator node) {
     token(node.keyword);
     space();
     visitCommaSeparatedNodes(node.shownNames);
   }
 
   visitSimpleFormalParameter(SimpleFormalParameter node) {
     visitMemberMetadata(node.metadata);
     modifier(node.keyword);
-    visitNode(node.type, followedBy: space);
+    visitNode(node.type, followedBy: nonBreakingSpace);
     visit(node.identifier);
   }
 
   visitSimpleIdentifier(SimpleIdentifier node) {
     token(node.token);
   }
 
   visitSimpleStringLiteral(SimpleStringLiteral node) {
     token(node.literal);
   }
@@ skipping 574 matching lines @@
     var lastLine =
         lineInfo.getLocation(lastOffset).lineNumber;
     var currentLine =
         lineInfo.getLocation(currentOffset).lineNumber;
     return currentLine - lastLine;
   }
 
   String toString() => writer.toString();
 
 }