Scrolling-backwards bad behaviour
Submitted by Alessio Bolognino
When in not-continuous mode, if I scroll backwards (shift+space), and only a part of the document is displayed because of the zoom, the bottom part of the previous page should be displayed before the top.
e.g. Only half of the page is displayed at time; let's label the two parts #a (top) and #b (bottom): I'm reading 4a (top of page 4), if I scroll down (press space bar), I see 4b; when I scroll down again I see 5a and then 5b. So, scrolling down: 4a -> 4b -> 5a -> 5b. And that's obviously fine.
Let's say I'm reading 5b, if I scroll backwards I see 5a, if I scroll backwards again I see 4a, and not 4b like I (IMHO) should.
Scrolling backwards I would expect: 5b -> 5a -> 4b -> 4a, but instead I get: 5b -> 5a -> 4a.