https://bugs.kde.org/show_bug.cgi?id=407294

            Bug ID: 407294
           Summary: KFontView does not display font previews properly on
                    hidpi screen with scaling
           Product: kfontview
           Version: 5.15.4
          Platform: Kubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-b...@kde.org
          Reporter: douglas...@sjtu.edu.cn
  Target Milestone: ---

Created attachment 119890
  --> https://bugs.kde.org/attachment.cgi?id=119890&action=edit
Screenshot of kfontview, scaling factor = 1.7

SUMMARY
The KDE Font Viewer does not display properly on hidpi screens with screen
scaling, leaving white margins on the bottom and right side of the font preview
area. I use a fractional scaling factor, which is 1.7. The preview part in the
font management settings is also influenced. The screenshots of kfontview and
the font management settings is shown in the attachments. It seems that the
ratio of the total width/height of the font preview area and the width/height
of the area actually used is just the scaling factor 1.7.

STEPS TO REPRODUCE
1. Set the screen scaling factor to 1.7 (maybe any number between 1 and 2 is
OK) in the display setting;
2. Open the font management settings window or kfontview.

OBSERVED RESULT
White margins in the font preview area.

EXPECTED RESULT
No margins, full area used for font preview.

SOFTWARE/OS VERSIONS 
Linux/KDE Plasma: Kubuntu 19.04
KDE Plasma Version: 5.15.4
KDE Frameworks Version: 5.56.0
Qt Version: 5.12.2

ADDITIONAL INFORMATION
Screen resolution: 2560x1440. Using Intel UHD Graphics 620 graphics card with
ubuntu's offical driver.

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