Yep, yep! Roger that.
Are there any other formats you can think of that sort of get around this wee quirk of PDF?
One idea that occurred to me was to sort of render the headings FIRST? And, then transform them into background images? I mean - that'd be a whole other step, for sure, in the conversion process EPUB >> PDF, but it would be sort of a sweet win.
The thing about the headings is a pain - almost like having the filename you're working on appended to any copy and paste. The files I use are all loooooooong from, and many a time I've had to go fish out the information. Whenever I'm on a conceptual roll, it's always a huge sort of mental momentum breaker for me. Half the time I'll just leave them in to keep the any motion going - but that's even worse in a way - coming back to find something floating around in notes I've made that's only like half the author's name and a page number, or a sub-chapter title.
What do you think? Does my switch to background image before rendering text in body of pages have any validity?
And! THANK YOU for Calibre! RARE have so many owed so much to - one GUY! Calbre is the jam, Kovid. THANK YOU!

))