That is not what I'm asking about. I don't mean the opacity of inactive window. What I want to disable is GTK's setting of the color of various elements depending on whether the window has focus or not. Even with compositor opacity set at 100%, GTK windows that don't have focus get that dim grey text. The color is, technically, theme-defined; unfortunately, both Adwaita and Greybird use a really low-contrast color that I find really difficult to read on some monitors.