Arch Linux

Description:
in KDE, there is an option to scale the display. It works pretty fine, except for some apps. Steam for example is completely ignoring it making the window super small, but that is the same on windows. Reading PDF in okular though is more disturbing...

The application is rendering at a different resolution and then scaling up orribly the PDF.

This is already known in upstream:
https://bugs.kde.org/show_bug.cgi?id=362856
but it seems is going to take a while before is fixed. Can we apply a small patch to the okular package to have a temporary solution? It should just unset the environment variable QT_SCREEN_SCALE_FACTORS before launching the application and everything looks fine (also properly scaled, not small).

Is it feasible? Because, to be fair is quite an annoying bug.

Additional info:
* package version(s)
okular: 17.04.2-1
kf5: 5.35.0-1
qt5-base: 5.9.1-1
plasma-desktop: 5.10.3-1
* config and/or log files etc.
systemsettings5 -> display and monitor -> displays -> scale display -> scale set to 2
relevant environment variables:
DESKTOP_SESSION=/usr/share/xsessions/plasma
KDED_STARTED_BY_KDEINIT=1
KDE_FULL_SESSION=true
QT_AUTO_SCREEN_SCALE_FACTOR=0
QT_QUICK_CONTROLS_STYLE=org.kde.desktop
QT_SCREEN_SCALE_FACTORS=HDMI-0=2;DP-0=2;DP-1=2;DP-2=2;DP-3=2;DP-4=2;DP-5=2;
SHLVL=2
XCURSOR_SIZE=0
XCURSOR_THEME=breeze_cursors
XDG_CURRENT_DESKTOP=KDE
XDG_DATA_DIRS=/usr/share:/usr/share:/usr/local/share
XDG_RUNTIME_DIR=/run/user/1000
XDG_SEAT=seat0
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
XDG_SESSION_CLASS=user
XDG_SESSION_DESKTOP=KDE
XDG_SESSION_ID=c2
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session1
XDG_SESSION_TYPE=x11
XDG_VTNR=1
CHROMIUM_USER_FLAGS= --force-device-scale-factor=1





Steps to reproduce:
systemsettings5 -> display and monitor -> displays -> scale display -> scale set to 2
(it should be a problem at every scale setting different than 1)

open okular, any PDF