Try to keep constructor calls together. Fix #119.

test/splitting/constructors.unit

Index: test/splitting/constructors.unit
diff --git a/test/splitting/constructors.unit b/test/splitting/constructors.unit
index 8687d3c3c6a56afa758fb4e818a1e4b02d0ee3f2..02862c4ae5340a1cfa239819daeb5b6056ff65f9 100644
--- a/test/splitting/constructors.unit
+++ b/test/splitting/constructors.unit
@@ -31,4 +31,10 @@ class Foo extends Bar {
   Foo(int a, int b)
       : super(a),
         this.b = b == null ? 0 : b;
-}
+}
+>>> try to keep constructor call together
+var longIdentifier = new Thing(
+    argument, argument);
+<<<
+var longIdentifier =
+    new Thing(argument, argument);