Bug 436223

SUMMARY

Krunner doesn't scale correctly for Firefox and other GTK applications.
Qt applications work well.

I am using KDE with Wayland, 4K resolution with 2x scale factor.
The application scales correctly when started from commandline or plasma application launcher, but it starts with incorrect scale with krunner.

STEPS TO REPRODUCE
1. Start krunner and type "firefox"
2. Start firefox
3. The result application window text looks small (doesn't scale correctly)

OBSERVED RESULT
The result application window text looks small (doesn't scale correctly)

EXPECTED RESULT
The result application window should scale correctly.


SOFTWARE/OS VERSIONS
openSUSE Tumbleweed 20210423
Linux: 5.11.15
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

Inspecting into the process's environment variable, I find "GDK_SCALE=2" and "GDK_DPI_SCALE=0.5", which leads to incorrect scaling.

The process UI scale correctly if started from commandline or from Plasma Application Launcher. And it doesnot have the above two environment variables set when I start it from there.

Therefore, it must be krunner incorrectly set the above two environment variables somewhere.