QTI 2.1: remove indenting of the XML files

The issue happen with this:

Nenne vier Tipps zur <strong>Abfallver</strong> <strong>meindung</strong>

The author see the error, remove the space between the 2 words:

Nenne vier Tipps zur <strong>Abfallver</strong><strong>meindung</strong>

But the indenting of the XML file will produce a return between the 2 words again and the browser display a space. The author cannot correct this error without removing the bold on the 2 words, correct the error, make the new word bold again.