Tidy command adds extra spaces to XML declarations

[kristoferjoseph]

Steps to reproduce:

1. in a script block declare a variable as a formatted XML block.
   EXAMPLE:

 
        
                                       foo
                                       bar
                                       baz
                                    ;
        ]]>

1. run the tidy command.

Expected result:
You would expect the tidy command to only format the xml block once

Actual result:
The xml variable is formatted as many times as you run the tidy command. Creating huge spaces between xml nodes.