Created attachment 132186 [details] Screenshot of the wrong behavior SUMMARY They are drawn with the window color instead of the lighter one used for docks. Also draws a line below them. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.20.80 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.0
Created attachment 132187 [details] Look before 509ff6bc
The line may be intentional (at least I think it's an improvement) but the color clearly is not.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/breeze/-/merge_requests/40
Git commit 0a8a4bd1c310d73c9952886d80d1d1d5bdff7350 by David Redondo. Committed on 13/10/2020 at 10:04. Pushed by davidre into branch 'master'. Do not alter the toolbars of QMainWindows that are not windows It can happen that an application uses a QMainWindow in its widget hierachy for its features but does not correspond to an actual window. Only alter those toolbars for the unified look whose QMainWindows are actual windows and as such have a window decoration. M +2 -1 kstyle/breezestyle.cpp M +4 -2 kstyle/breezetoolsareamanager.cpp https://invent.kde.org/plasma/breeze/commit/0a8a4bd1c310d73c9952886d80d1d1d5bdff7350