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