ConstReadonlyAlways: 1Apply on every call.
ReadonlyAppearing: 8Apply on first appearance or when returning after an inactive frame.
ReadonlyFirstUseEver: 4Apply only when no saved INI settings exist for the window.
ReadonlyNone: 0Apply unconditionally, equivalent to Always.
ReadonlyOnce: 2Apply once per runtime session.
Conditions for applying window settings; choose one, do not combine.