https://bugs.kde.org/show_bug.cgi?id=457301
Bug ID: 457301
Summary: Running applications start to use the general font for
everything after any font setting is changed
Product: systemsettings
Version: 5.25.3
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_fonts
Assignee: plasma-b...@kde.org
Reporter: hexclo...@outlook.com
Target Milestone: ---
SUMMARY
If some new setting is applied in the fonts KCM, applications that are
currently open start to use the (new) general font for things like menus and
toolbars. The new menu/toolbar/... font settings will only take effect after
the application is restarted.
STEPS TO REPRODUCE
1. In system settings, set the general, menu and toolbar fonts; say we have
Noto Sans Regular, Noto Sans Bold, Noto Sans Italic respectively.
2. Open a Qt application that have context menus and/or toolbars, say Dolphin.
It should use the fonts above.
2. Keep Dolphin open. In system settings, change any setting and apply; for
example, change the menu font to Monospace.
3. Right-click to open the context menu in Dolphin.
OBSERVED RESULT
In the last step, Dolphin uses the General font (Noto Sans Regular) instead of
the Menu font (Monospace) for the right-click menu.
EXPECTED RESULT
Dolphin should use exactly the new font settings. (use Monospace for the menu)
SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.25.3
KDE Frameworks Version: 5.96.0
Qt Version: 5.15.5
ADDITIONAL INFORMATION
I think this is a problem in the KDE Qt platform theme:
https://github.com/KDE/plasma-integration/blob/bc6f94f02709b4b2fc7c3da3149c330eedd39a16/src/platformtheme/kfontsettingsdata.cpp#L93
When new font settings are applied, lines 93-97 cause the existing application
to use the general font as the default for all widgets.
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