[okular] [Bug 433828] New: Bug with annotations on jpg or png when display scaling is enabled.

[Éric Brunet]

https://bugs.kde.org/show_bug.cgi?id=433828

            Bug ID: 433828
           Summary: Bug with annotations on jpg or png when display
                    scaling is enabled.
           Product: okular
           Version: 1.11.1
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: eric.brunet at lps.ens.fr
  Target Milestone: ---

Created attachment 136303
  --> https://bugs.kde.org/attachment.cgi?id=136303&action=edit
Video of the bug in action

I have an uptodate fedora 33 computer, with okular-20.08.1-1.fc33.x86_64.rpm
(reporting as okular 1.11.1).

I have an issue which
1) occurs with .jpg and .png files, but not with .pdf files
2) occurs only when System Settings->Display Configuration->Global scale is not
set to 100%. (Specifically: I have it set at 200%).

The bug is the following: when trying to use the "Freehand line" annotation
tool, everything works correctly while I draw. But when the drawing ends (when
I release the mouse button, or when I remove my finger from the touchscreen),
the whole drawing gets dilated by a factor of 2 from the upper-left corner: all
the coordinates are multiplied by 2.

I am attaching a small video to illustrate the problem.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Fedora 33 
KDE Plasma Version: plasma-desktop-5.20.5-1.fc33.x86_64
KDE Frameworks Version: kf5-kparts-5.79.0-2.fc33.x86_64
Qt Version: qt5-qtbase-5.15.2-2.fc33.x86_64

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