https://bugs.kde.org/show_bug.cgi?id=511777
Bug ID: 511777
Summary: `QIcon::setFallbackThemeName()` not working like
expected in the runtime
Classification: Developer tools
Product: Qt/KDE Flatpak Runtime
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
I have the following code in my application:
```
QString fallbackThemeName = QIcon::themeName();
QIcon::setThemeName("white");
QIcon::setFallbackThemeName(fallbackThemeName);
```
the application has a white icon theme embedded in its executable using the Qt
resource system for some custom icons.
actual code can be found here:
https://github.com/Rosalie241/RMG/blob/v0.8.7/Source/RMG/UserInterface/MainWindow.cpp#L338-L441
when setting the icon theme with QIcon::setThemeName() and then set a fallback
using QIcon::setFallbackThemeName(), it appears that the fallback theme name is
not respected in the runtime.
I always get black fallback icons while I'm using dark breeze for icons that
the embedded icon theme doesn't provide, even though the fallbackThemeName
variable is set to 'breeze-dark', hardcoding it to anything else has no effect
either.
STEPS TO REPRODUCE
1. set system KDE theme to breeze dark
2. download/build https://github.com/flathub/com.github.Rosalie241.RMG
3. open the settings dialog (settings -> settings) and see the
defaults/ok/cancel buttons having incorrect icons
when building the application natively outside the flatpak, it works like
expected and shows the correct fallback icons.
EXPECTED RESULT
I'd expect the icons to show the correct fallback icons.
I'm using Fedora KDE 43 with a fully up-to-date system.
I'm not sure where the issue lies, but considering it only happens within the
flatpak runtime and not the AppImage or natively built packages, my guess is
that it might be runtime related.
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