[okular] [Bug 449865] New: Trim margins: irregular behavior which hinders page-by-page navigation

[rgreen]

https://bugs.kde.org/show_bug.cgi?id=449865

            Bug ID: 449865
           Summary: Trim margins: irregular behavior which hinders
                    page-by-page navigation
           Product: okular
           Version: unspecified
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: greenandpleasant2000-support at yahoo.co.uk
  Target Milestone: ---

Created attachment 146493
  --> https://bugs.kde.org/attachment.cgi?id=146493&action=edit
PDF doc. showing navigation issue with "Trim Margins"

SUMMARY
***
(Originally filed at Bug 449492).

When you trim margins you should be able to reduce the width of the program
window to just encompass the trimmed document width, AND still be able to
navigate page-by-page using the keyboard L/R arrows. However there is a bug
somewhere that prevents this happening under MOST (but not all) circumstances,
and the document is behaving, for navigation purposes, as if the marins are
still present.
***
After some investigation I was able to come up with a formula to successfully
minimize the width of the program window without interfering with page-by-page
keyboard arrow navigation:

1. Open the attached pdf document and set to page 1.
2. Trim margins and reduce the width of the window slightly, so that a scroll
bar appears (even though it shouldn't since there should still be plenty of
space around the trimmed sides.
3. Close the pdf doc. and reopen.
4. Now use the mouse wheel to scroll down through the pages.

RESULT: The horizontal scroll bar disappears at page 9! Now the document width
can be reduced to the trim margins.

5. Close and reopen the program.

RESULT: The horizontal scroll bar appears again! 

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Linux Mint 20.
KDE Plasma Version: 
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.3

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