When you insert a new document in a master document, the new document is created
with the default template instead of the master document's template.

Steps to reproduce:

1. Open a master document with a non-default template
2. Open the navigator
3. Select "Insert > New document"
4. Create the new document
5. Open the new document
6. Look at the templates, they are the ones from the default template

Since assigning a different template to an existing document is not possible,
this bug makes the New document feature useless.

As a work-around, you have to first create the subdocument from the same
template as the master document and then insert it into the master document via
"Insert > File".