[kde] [Bug 439937] New: Debian 11 - Opentype bitmap fonts are displayed with surrounding whitespace when display scaling is enabled

[Tim Small]

https://bugs.kde.org/show_bug.cgi?id=439937

            Bug ID: 439937
           Summary: Debian 11 - Opentype bitmap fonts are displayed with
                    surrounding whitespace when display scaling is enabled
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: tim at buttersideup.com
  Target Milestone: ---

Created attachment 140109
  --> https://bugs.kde.org/attachment.cgi?id=140109&action=edit
KDE font selection dialogue showing excess spacing around font preview for
Terminus Bold.

SUMMARY

When a bitmap font is selected, and display scaling is also enabled (KDE
-> System Settings -> Display Configuration -> Global scale != 100%),
then the fonts are rendered at their unscaled size (this is expected for
bitmap fonts), but instead each character is rendered with large amounts
of surrounding space.

T h e   e f f e c t   i s   a   b i t   l i k e   t h i s ,  a n d   i s

n o t   u s a b l e .


STEPS TO REPRODUCE
1. Install Debian 11
2. Install the fonts-terminus-otb
3. System Settings -> Display and Monitor -> Display Configuration -> Global
Scale = 175%
4. Konsole -> Settings -> Edit Current Profile -> Appearance -> Font -> Choose
-> Terminus Bold

OBSERVED RESULT

S p a c e d   o u t   t e x t .

EXPECTED RESULT

Not spaced out text.

Gnome terminal behaves as I would expect in this case - instead it choses a
different point size (e.g. if user has chosen 10 point, it will select nearest
available font to ("chosen font * global scale factor") = 18 point.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Debian 11
(available in About System)
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

Debian bug 989831 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989831

See also KDE bug #439936

I've found I can workaround this issue by disabling scaling in konsole
by launching it with this wrapper:

#!/bin/sh
export SAVE_QT_SCREEN_SCALE_FACTORS="$QT_SCREEN_SCALE_FACTORS"
export SAVE_QT_SCALE_FACTOR="$QT_SCALE_FACTOR"
unset QT_SCREEN_SCALE_FACTORS
export QT_SCALE_FACTOR=1
exec /usr/bin/konsole

...and then restoring the SAVE variables in the shell rc so that they
are not inherited by commands which are launched from within konsole.

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