Create a 'lookahead'-origin, 'speculative'-priority controller that also aborts when updateSignal aborts.
'lookahead'
'speculative'
updateSignal
Optional
The scheduling update's abort signal, when it has one.
A fresh controller the caller owns (abort it on view change / dispose).
Create a
'lookahead'-origin,'speculative'-priority controller that also aborts whenupdateSignalaborts.