[okular] [Bug 423702] New: bad scaling on external monitor if QT_SCREEN_SCALE_FACTORS is set.

[San]

https://bugs.kde.org/show_bug.cgi?id=423702

            Bug ID: 423702
           Summary: bad scaling on external monitor if
                    QT_SCREEN_SCALE_FACTORS is set.
           Product: okular
           Version: 1.10.2
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: sanette-linux at laposte.net
  Target Milestone: ---

Created attachment 129796
  --> https://bugs.kde.org/attachment.cgi?id=129796&action=edit
good/bad antialiasing

SUMMARY
bad scaling on external monitor, almost impossible to read at normal size,
if QT_SCREEN_SCALE_FACTORS is set.

STEPS TO REPRODUCE
1. have a Hi-DPI laptop (here 3200x1800)
2. connect an external normal-dpi monitor (1920x1200) to extend the desktop
3. open a PDF document and move the window onto the external screen

OBSERVED RESULT

the PDF is scaled with very bad antialiasing.

EXPECTED RESULT

nice antialiasing


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Neon User
KDE Plasma Version:  5.19.2
KDE Frameworks Version: 5.71.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION

Workaround: 
export QT_SCREEN_SCALE_FACTORS=''
before using okular, then it works

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