I haven’t seen anyone mention this. But what I find is that when I compile to rtf, the last paragraph is single spaced if I don’t put a carriage return at the end of that paragraph, for some word processors. I haven’t played with this much, and can post a recipe to replicate it if needed, but what I find is
I set compile line spacing at either double (2.0) + at least 12 points, or single + at least 28 points
I delete the terminal carriage return in the last paragraph in the last document to be compiled
The line spacing in the .rtf is not correct, if I open with NeoOffice or LibreOffice. It is correct if I open with Mellel or Pages, but then other parts of the compiled text are screwy, which is why I prefer NeoOffice.
So I suspect that the generated rtf of the last paragraph is subtly different depending on whether there is an terminal carriage return.