* afterResume had *two* different implementations, so the historical one
that handled frontlight fixups no longer ran
(regression since #10426)
* isFrontlightOn was completely broken, for a couple of reasons:
* There was no is isFrontlightOnHW implementation, so when it ran, it
mostly always thought the frontlight was on, because
self.fl_intensity doesn't change on toggle off.
* _decideFrontlightState was never called on Kindle,
so isFrontlightOnHW was never really called, making isFrontlightOn
completely useless. Call it in setIntensityHW's coda, as it ought to
be. And properly document that.
Generic *was* calling _decideFrontlightState is setIntensity, but
*before* actually setting the frontlight, which makes no goddamn sense,
so get rid of that, too.
* Also fix frontlight toggle notifications (regression since #10305)
TL;DR: The PowerD API being a mess strikes again.
9af3e95d9d