Created attachment 157196 [details] screenshots Since Plasma 5.27, dialog windows (e.g. the "About KDE" dialog, but also some dialogs in system settings) have a line between the window content and the title bar (see attached screenshot). This affects both Breeze Dark and Breeze Light themes. This affects only dialog windows, but not normal windows. Because setting the application style to Oxygen, but keeping the decoration style as Breeze does not produce these lines, I think that this is unrelated to window decorations and rather a bug in the application style. STEPS TO REPRODUCE 1. open Konsole 2. go to Help->About KDE 3. observe line between title bar and window content
I'm afraid this was an intentional visual change. At this time we're not planning to revert the change.
As far as I can tell, this was introduced in https://invent.kde.org/plasma/breeze/-/merge_requests/11 . I can sort of see that one would want to separate tools from the actual content of the window, but I don't get the reasoning behind also drawing the separator if there is no tool area, such that it ends up directly below the title bar. This just looks very inconsistent compared to all other windows.