Bug 419374

Summary:	Scaling for GTK doesn't work
Product:	[Applications] systemsettings	Reporter:	jan.claussen10
Component:	kcm_kscreen	Assignee:	kscreen-bugs-null <kscreen-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	nate, plasma-bugs-null, subdiff
Priority:	NOR
Version First Reported In:	5.18.3
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description jan.claussen10 2020-03-29 11:36:54 UTC

SUMMARY
I have scaled my screen to 175%. Everything is scaled right except the GTK applications.

SOFTWARE/OS VERSIONS
Linux: 5.4.28 MANJARO 
KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1

Comment 1 Roman Gilg 2020-03-29 12:58:20 UTC

What new scaling? Is it X11 or Wayland? Please make some screenshots.

Comment 2 jan.claussen10 2020-03-29 17:29:45 UTC

No screenshot necessary. This is caused by GTK3, since it doesn't support non-integer scaling. When I set the scaling to 200%, GTK scales as well. But then the performance in Xournal++ gets really bad. One the other hand palm rejection works again.

Comment 3 Nate Graham 2020-04-15 00:32:51 UTC

GTK doesn't support fractional scaling yet, which is why only integer scale factors (i.e. 100%, 200%, 300%) affect GTK apps. Once GTK gains support for fractional scaling, we can turn apply our fractional scale factors to GTK apps as well.