SUMMARY: When the system color is set to Breeze dark, QT apps like Okular uses dark icons (Even if icons is set to Breeze, not Breeze Dark). But GTK apps like LibreOffice and Inkscape icons are still black and not visible. You should go to their settings (If there's any) and set icons to Breeze Dark individually, or you should set system icons to Breeze Dark globally. SUGGESTION: I think there should be three icon sets instead of two (Breeze, Breeze Dark, Breeze Light), Something like Plasma Style Which follows color scheme automatically. SOFTWARE/OS VERSIONS: KDE Plasma Version: 5.26.0 KDE Frameworks Version: 5.99.0 Qt Version: 5.15.6 Graphics Platform: X11
Yeah, this is somewhat confusing. Both the the "Breeze" and "Breeze Dark" icon themes follow the color scheme, but when following the color scheme isn't working or is broken, each one falls back to a different default color. If the icons aren't changing color properly, it means one of two things: 1. The apps are using the Adwaita theme or something other than breeze-gtk 2. Plasma-integration is broken Are the apps using the breeze-gtk theme? Or something else? Can you attach a full-screen screenshow that shows the affected apps, along with the apps that are working properly?
Created attachment 152964 [details] Libreoffice - Breeze Icons - Libreoffice Icons are set to "Breeze (Automatic)"
Created attachment 152965 [details] Inkscape - Breeze Icons
Created attachment 152966 [details] Libreoffice - Breeze Dark Icons
Created attachment 152967 [details] Inkscape - Breeze Dark Icons
I added the screenshots (Sorry I couldn't attach them all together). These are two affecting apps. Both use breeze-gtk I think. And one other thing is, QT apps obviously works correct in both cases. And I don't see any difference on them by setting icons to "Breeze" or "Breeze dark". (So, why there are two different icon sets?)
The LibreOffice issue is actually a bug in LibreOffice itself, believe it or not. It has its own internal icon settings and defaults to Breeze Light icons, but isn't smart enough to switch automatically to Breeze Dark icons when the rest of the system is dark. You can fix this yourself by telling LibreOffice to use Breeze SVG icons, which change color automatically. See also https://bugs.documentfoundation.org/show_bug.cgi?id=115439 So let's focus on Inkscape here.
Do the icons in Gedit change their color properly when you use the Breeze GTK theme, the Breeze icon theme, and the Breeze Dark color scheme?
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(In reply to Nate Graham from comment #8) > Do the icons in Gedit change their color properly when you use the Breeze > GTK theme, the Breeze icon theme, and the Breeze Dark color scheme? It workes properly with Gedit and Meld (I only had this two on my system. But Icons are visible)
In that case breeze-gtk appears to be doing the right thing in general, and the issue in Inkscape is specific to Inkscape, just like the LibreOffice bug is.