Comment 2 for bug 1547831

And using the "Set" button in the Text dialog removes the <title> and <desc> elements (the whole text is then written in the <text> element).
Apparently the Text dialog always loads and saves all children of a <text> (or <flowRoot>) element as if they were text (e.g., in src/ui/dialog/text-edit.cpp:310, SPTextPath *tp = SP_TEXTPATH(text->firstChild());)