yes, it turns out I was using flowed text. I think it would be worthwhile to include support for flowed text, since this is the default in Inkscape, as far as I can tell.
Hi, I'm working on the extension to support flowed text and it is almost done! ;)
My version supported both text flavors, I just pulled the @x and @y from the object defining the flow shape.
Yes, I have discovered how to retrieve these values.
I don't think it's critical for the split text to be in exactly the same place, or even to have exactly the same style, as the original, although it's nice if it doesn't appear off screen.
Well, I think a user would expect the splitted text to be in the same place ;)
Karlisson, let me know if you want me to pitch in on your current version at all.
OK! Thanks!