TrExtendX<MILLIS_FUNCTION, TRANSITION> TrExtend<MILLIS, TRANSITION>
Runs the specified transition, then holds the last value for some additional time specified by MILLIS_FUNCTION.
https://github.com/profezzorn/ProffieOS/blob/6f8add544c627172ad2dd698c90e5e55078a420a/transitions/extend.h#L6