Format correctly for chained call nodes with arguments

Author: kddnewton

lib/syntax_tree/node.rb

@@ -2290,7 +2290,15 @@ def format(q)
             q.format(message) if message != :call
           end
 
-          q.format(arguments) if arguments
+          case arguments
+          in ArgParen
+            q.format(arguments)
+          in Args
+            q.text(" ")
+            q.format(arguments)
+          else
+            # Do nothing if there are no arguments.
+          end
         end
       end
     end

lib/syntax_tree/prettyprint.rb

@@ -1020,6 +1020,7 @@ def if_break
   # to build the break contents.
   def if_flat
     doc = IfBreak.new
+    target << doc
 
     with_target(doc.flat_contents) { yield }
   end