doc explanation

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@277152 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/launch/Launcher.java

@@ -150,6 +150,10 @@ public class Launcher {
                 argList.add(args[i]);
             }
         }
+        
+        //decide whether to copy the existing arg set, or
+        //build a new one from the list of all args excluding the special
+        //operations that only we handle
 
         if (libPaths.size() == 0 && cpString == null) {
             newArgs = args;