Created attachment 118441 [details] Dark KWin decoration and light headerbar SUMMARY I'm using the light Breeze theme with dark Breeze window borders. In this setup, GTK3 apps with headerbars look out of place with both the light and dark GTK themes, because either the headerbar will be light as well, or the whole app will be black. STEPS TO REPRODUCE 1. Set Desktop theme to "Breeze Dark", and Qt widget style to "Breeze" (light) 2. Set GTK style to "Breeze" (light) 3. Start a Qt and a GTK3 app (e.g. evince or gedit) 4. Observe the difference in Kwin title bar and GTK3 headerbar OBSERVED RESULT The GTK3 headerbars look out of place because they are light, while all other (Kwin) title bars are dark EXPECTED RESULT It would be great if there was an additional third GTK3 theme for light widgets with dark headerbars (+light window buttons). ADDITIONAL INFORMATION This also affects the Firefox CSD, which will render dark window buttons on a dark title bar (essentially making the window buttons invisible, c.f. https://github.com/vfrico/firefox-breeze-duo/issues/2).
*** This bug has been marked as a duplicate of bug 403426 ***
I don't think this is a duplicate. bug#403426 is about active and inactive windows, this one here is about light widget theme with dark window borders/headerbar for *active* windows.
Ah you're right. Then it's a duplicate of Bug 356006. :) *** This bug has been marked as a duplicate of bug 356006 ***
Since this is linked from a Firefox theming extension, I'll add: for the Firefox part, this bug is not a duplicate. Firefox headerbars remain unfixed in Breeze. I remember Carson said Firefox's GTK color usage was a mess, but the fact is that Firefox CSD still can not be used in default Plasma configuration.
That would be Bug 407639.