[okular] [Bug 169614] Next/Previous Page should keep position on page

[James Flynn]

https://bugs.kde.org/show_bug.cgi?id=169614

James Flynn <my-kde at duk13.win> changed:

           What    |Removed                     |Added
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                 CC|                            |my-kde at duk13.win

--- Comment #5 from James Flynn <my-kde at duk13.win> ---
Just to add some explanation, other PDF viewers in particular but also some
other document viewers/editors will use this behavior under a secondary
keybinding (e.g. CTRL+Page Up/Page Down). ~~Thus this could be viewed as an
additional feature perhaps, rather than having to decide between behaviors.~~
There already appear to be two behaviors that I have noted below. The 

That said, this is a nice-to-have feature for heavy PDF inspecting/use is
jumping forward/backward pages but retaining the position on a page (e.g. zoom
level, view-shift left/right, and vertical scroll on a page). This is useful
for use checking things like header/footers, title blocks on drawings, and for
quickly viewing overall formatting like margin sizing.

When using single-page view and zoomed out to at least fit the page, this is
already usable this way. However for large document pages, or smaller details
within a page, zooming and panning becomes necessary. 

Interestingly, there already are somewhat two behaviors. Both will preserve the
level of zoom (which is desired!). However:
 1. When zoomed in, using the scroll wheel, arrow keys, and Page up/down to
navigate will preserve your horizontal position in a page, but page up/down
will not retain vertical position on page.
 2. Paging using the next/previous page buttons will reset the relative page
position to a default location on each page change.
  - If this default position is kept by the user, this behaves as
desired/described by others, however it seems like this "default position"
being changed to match the previous view would be more desired.

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