Thank you very much for your time!
First, I have to explain an embarrassing fact that I should have included in my original post (I did so in my first forum post some days ago, but forgot it here):
I'm
absolutely new to ebooks, and the embarrassing part is that I don't even have the time to really learn much about it, so I have to fake it as I go along, copying code I don't understand, as I literally don't have a clue about the very basics.
I just happen to have this one long mess of a physical book, with lots of styles and fonts, and thanks to the good people here, my digital version actually looks correct now, with the exception of this space-thing.
And to make matters worse,
I only now realize that the forum software here treats my spacing exactly like the ebook readers, e.g. it cuts away extra multiple spaces between words.
So how jhowell actually managed to quote a correct version of my original post (two post up) is completely beyond me!
But this is what it should look like:
"asdfkl xxxxxxxxxx sdfkjsdfl"
(Where the x's represent additional empty spaces.)
So I'm sorry that I inadvertently led GrannyGrump, kovidgoyal, Turtle91 and everybody else in a wrong direction.