Created attachment 1454644 [details] Gnome-terminal_Gnome-tweaks Description of problem: While theme Adwaita (default) is selected to be applied to Applications, it is partially applied, Version-Release number of component: gnome-terminal.x86_64 3.28.2-2.fc28 Actual results: Illustrated just as random example in snapshot; On top, Gnome terminal's title bar looks like displayed according to the non-selected theme Adwaita-dark. On background Gnome Tweaks window. Expected results: Selected theme applied. Additional info: On Gnome session.
I believe this is intended behavior to make terminal chrome less distracting, same as in Boxes, Photos, Image Viewer, Videos and Weather. GTK themes have a dark variant that apps can request. You can change this for Terminal in particular via Preferences > General > Theme Variant preference.
That might be so. Thank you.
See: Preferences -> Theme variant