[okular] [Bug 432441] New: Okular sometimes shows a double-page layout despite selecting single-page layout

[Daniel]

https://bugs.kde.org/show_bug.cgi?id=432441

            Bug ID: 432441
           Summary: Okular sometimes shows a double-page layout despite
                    selecting single-page layout
           Product: okular
           Version: 20.12.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: daniel-other+kdebug at dadosch.de
  Target Milestone: ---

Created attachment 135382
  --> https://bugs.kde.org/attachment.cgi?id=135382&action=edit
A screenshot of okular showing double-page-mody, despite the button of one page
mode beeing selected. Note that for privacy and copyright reasons, part of the
document and screenshot have been covered

SUMMARY
Apparently, under certain circumstances, okular changes the mode from
single-page view to double-page view without any user interaction. Also, the
single-page button is still enabled.

STEPS TO REPRODUCE
Still unclear for me, probably it has something to do with resizing the window
or minimizing or changing (unplugging) screens. This has happened multiple
times  to me in the last days, with different pdfs, but I was unable to detect
the cause.

OBSERVED RESULT
See screenshot. A double-page view is used, but the single-page view-button is
enabled. No apparent error is logged in the syslog.

EXPECTED RESULT
View mode should not change by rearranging/resizing/… and should be consistent
with the buttons

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2
Kernel Version: 5.10.11-arch1-1
OS Type: 64-bit

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