Originally Posted by Mono
I think it should work as you describe by design.
So, generally, dotted lines show only if you are close to botttom or top of the page.
At least, this is my understanding, how it works.
I see, thank you for explaining. But in continuos scroll mode this seems to be useless & confuse me. Because there is no page end or start in it's common sense — you have a continuos page & when you get «page turn» (or, if be more precise, scroll down for next part of this endless page), current page is overlaped with a few lines of of the previously displayed page's text. And it's not too easy to spot where i have finished my reading.
In a such case dotted lines will be very helpful.