LuneOS-Components: Unify display resolution settings

[Herrie82]

Describe the bug
We currently define resolution in 2 different places which can be confusing.

https://github.com/webOS-ports/meta-webos-ports/blob/kirkstone/meta-luneos/recipes-webos-owo/luna-sysmgr-conf/luna-sysmgr-conf/raspberrypi3/luna-platform.conf#L21

https://github.com/webOS-ports/configd-data/blob/webOS-ports/webOS-OSE/configs/layers/base/raspberrypi3/com.webos.surfacemanager.json

The former is being used by LuneOS-Components: https://github.com/webOS-ports/luneos-components/blob/master/modules/LunaNext/Common/settingsadapter.cpp#L45-L54

Afterwards luna-next-cardshell uses this value as well. It would be better to get these values from configd instead.

[Tofee]

I totally agree. However we must be careful: in settingsadapter it's a sync call, whereas with configd it will be async (LS2 call). So we might introduce a bug or two when doing that.

[Herrie82]

I totally agree. However we must be careful: in settingsadapter it's a sync call, whereas with configd it will be async (LS2 call). So we might introduce a bug or two when doing that.

I doubt the resolution will change much at runtime, so I don't see big issues there, but good to keep in mind.

[Tofee]

I mean if there are some bugs, they'll mostly appear at startup time

[Herrie82]

There seems to be a libconfigd which might be around just for this?
Code: https://github.com/webosose/configd/blob/daab9ca0e43effc52c239d56387a6ca02e6dbb20/src/libconfigd/libconfigd.c

And some tests:
https://github.com/webosose/configd/blob/daab9ca0e43effc52c239d56387a6ca02e6dbb20/test_ref/tests/src/configd_client_libconfigd.c

[Tofee]

Ah, well, why not; but let's try the simple LS2 way first

[ericblade]

we might want to investigate if anyone's actually calling for that displayWidth/displayHeight .. or for that matter, an audit of anything referenced in that settings adapter -- I tweaked a few settings while trying to get RPi to boot in a different resolution, but this setting (as well as others like 'use virtual keyboard' that i noticed while digging in the file) seem to be completely unused.

[Herrie82]

we might want to investigate if anyone's actually calling for that displayWidth/displayHeight .. or for that matter, an audit of anything referenced in that settings adapter -- I tweaked a few settings while trying to get RPi to boot in a different resolution, but this setting (as well as others like 'use virtual keyboard' that i noticed while digging in the file) seem to be completely unused.

I checked this already, it's only referenced in 2 place currently:
https://github.com/webOS-ports/luneos-components/blob/master/modules/LunaNext/Common/settingsadapter.cpp

Which in turn relies on https://github.com/webOS-ports/luna-sysmgr-common/blob/2adc6e775a90c0ac9977ae666f5c8bfac1a19a6e/Src/base/settings/Settings.cpp#L274