Inherit the parent color-scheme. When set on the
AdwStyleManager returned by [funcStyleManager.get_default], it's
equivalent to ADW_COLOR_SCHEME_PREFER_LIGHT.
Always use dark appearance.
Always use light appearance.
Use dark appearance unless the system prefers prefers light colors.
Use light appearance unless the system prefers dark colors.
Application color schemes for [property
StyleManager:color-scheme].