[okular] [Bug 398771] New: EPub backend: changing default font size doesn't update the page number

[Neviril]

https://bugs.kde.org/show_bug.cgi?id=398771

            Bug ID: 398771
           Summary: EPub backend: changing default font size doesn't
                    update the page number
           Product: okular
           Version: 1.5.1
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: EPub backend
          Assignee: okular-devel at kde.org
          Reporter: nevineviril at yahoo.com
  Target Milestone: ---

=Background information=
Often, I need to read EPub ebooks a few meters away from my monitor and it is
helpful for this to increase the default font size and type (on my
configuration by default it's "Noto Sans, 10") to make text more easily
readable.

=Issue encountered=
I found that changing the font size and type in EPub backend options results in
Okular not updating the page number. Practically speaking, if an EPub Ebook has
a 200 page count and I increase the font size, text appears to be reflowed
correctly, but the page count would still remain 200. The most immediate issue
is that the book gets clipped, meaning that the end could not be read if not by
decreasing font size again.

Conversely, when decreasing the font size, blank pages result at the end of the
document, although this is more than an annoyance than a usage-breaking bug.

=Additional notes=
Closing/reopening Okular and/or the document does not seem to solve the issue.
I observed this issue with different EPub documents.

=Backend information=
Version 0.2.3
KDE Frameworks 5.49.0
Qt 5.11.1 (built against 5.11.1)
The xcb windowing system

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