Page-by-page navigation needs attention to ensure a functional experience which exhibits a systematic logic no matter how the page-by-page change is done.

The current experience, on 3.5.4.2 and 3.4.x, does not work effectively. It only works consistently at just the right level of zoom and only works with the Navigation toolbar set to 'Page' and then clicking on the 'next' and 'previous' (which I use at the bottom of the vertical scrollbar).


There are three modes of input (of which I know) for page by page navigation:
  * key presses on the 'PgUp' or 'PgDn' keys,
  * mouse clicks on the Navigation toolbar/widget at base of vertical scrollbar,
  * mouse wheel incremental rolls, some integer number of which will result in 
    a full page move.
I would expect similar or identical behaviour with all three. Note that the latter case has been described in:
  https://bugs.freedesktop.org/show_bug.cgi?id=42794


Note that there are several different zoom cases to consider: 
  * UI zoomed to a fraction of a physical page,
  * UI zoomed to a full page,
  * UI zoomed to more than a full page.
Regardless of the state, the expectation is that the UI will skip ahead so that an integer number of inputs (key presses, mouse clicks, scroll wheel scrolls) will result in the UI being in the identical state to the initial view but one page further in the document. 


Currently, the Navigation toolbar/widget works but only if the entire top of the page is visible including the header (in my case always empty) and more but not quite the whole 'paper' page, I am not sure why. On a constrained desktop, say a laptop, it is helpful to be able to zoom into the page as much as possible (in my case at 100% I can get all the text without the headers and footers, plus the comments). However, if I do that, currently the page down navigation will skip to the next page but will move the page to show a lot of blank at the top of the page. The work around is to zoom out and expose a lot of blank area which wastes screen estate but enables skipping forwards and back without having the relative position of the page change at all.

Currently, the use of the 'PgUp' and 'PgDn' keys moves by some random amount, without hitting the same position on the neighbouring page after an integer number of clicks. Similarly, the scroll wheel (which for me is *not* set to go page by page) does not land on the same position after twenty two clicks.


Thanks for the great work on libreoffice!
  ~Adrian Custer

LibreOffice is the version provided on Debian Wheezy gnu/linux.
The machine is a thinkpad from summer 2004, an R51.