Inner spans in EBU-TT-D XML files are lost upon import

[nebehr]

When a subtitle file in EBU-TT-D XML format is imported, and some entries in it contain more than one node, only the last is imported, the rest are discarded.

To reproduce, import sample file at https://www.bbc.co.uk/accessibility/forproducts/guides/subtitles/sample-ebuttd-prepared.html. Note that entry # 2 contains two nodes, but only the second one is imported.

Expected behavior: all entry text should be imported.

Version: 1.0.1.9, Windows