* 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.
Make sure we only send Suspend/Resume events when we *actually* suspend/resume. This is done via the Device `_beforeSuspend`/`_afterResume` methods, and those were called by the *input handlers*, not the PM logic; which means they would fire, while the PM logic could actually take a smarter decision and *not* do what the event just sent implied ;).
(i.e., sleep with a cover -> suspend + actual suspend, OK; but if you then resume with a button -> input assumes resume, but PM will actually suspend again!).
Existing design issue made more apparent by #9448 ;).
Also fixes/generalizes a few corner-cases related to screen_saver_lock handling (e.g., don't allow USBMS during a lock).
And deal with the fallout of the main change to the Kobo frontlight ramp behavior ;).
* Rejig frontlight warmth API to more closely match the existing API, and, hopefully, clarify some of its quirks, and reduce boilerplate and duplicate code in platform implementations.
* Tweak Kindle:setDateTime to prefer using the platform's custom script, as in interacts better with the stock UI. And make the fallbacks handle old busybox versions better.
* Add Kindle PW5 support ;).
* Add warmth support to the Kindle platform.
* Random TextBoxWidget cleanups: make sure we immediately free destroyed instances.
* FrontLightWidget: Refactor to make it slightly less obnoxious to grok and update; i.e., separate layout from update, and properly separate brightness from warmth handling. Move to simpler widgets instead of reinventing the wheel.
* TextBoxWidgets: Implement `setText` to match TextWidget's API, as some callers may be using the two interchangeably (i.e., Button).
* NaturalLightWidget: Make sure we pass a string to InputText
* InputText: Add debug guards to catch bad callers not passing strings ;).
move state change event to higher level function so it will be called after powerd.is_fl_on is updated.
makes _setIntensity redundant so get rid of it
obsoletes #6667
