Output of toPrettyString is broken

[andre2007]

The output of this code

import kxml.xml;
import std.stdio: writeln;

XmlNode nodeAttributes = new XmlNode("attributes");
nodeAttributes.addChild(new XmlNode("divisions").setCData("1"));
        
nodeAttributes.addChild(new XmlNode("key").addChild( 
  new XmlNode("fifths").setCData("0")));
    
nodeAttributes.addChild(new XmlNode("time").addChildren([
  new XmlNode("beats").setCData("4"),
  new XmlNode("beats-type").setCData("4") ]));

writeln(nodeAttributes.toPrettyString());

is

<attributes>
        <divisions>
                1
        </divisions>
        <key>
                <fifths>
                        0
                </fifths>
        </key>
        <time>
                <beats>
                        4
                </beats>
                <beats-type>
                        4
                </beats-type>
        </time>
</attributes>

The unecessary line breaks for the tag contents causes issues for other xml parsers.