[FR] Option/button to re-ask for location permission

Hi,

I almost exclusively use LineageOS or LineageOS-derived ROMS (such as /e/ : https://e.foundation/), with LineageOS Trust/Privacy Guard/AppOp permission control.

What I usually do when setting up a new device (I do this a lot) is go to Settings/Privacy and enable Trust for all apps by default, then check system apps too.

If I do this before starting MicroG Settings for the first time, everything’s fine.
But if I somehow forget to do it, especially after installing/activating locations backends, I end up in a quagmire of lost/unasked location permissions for GmsCore and its location backends, and eventually the infamous "UnifiedNlp has no location" (#366).

Recovering from that state without reinstalling usually means resorting to ADB commands, Xposed modules (such as AppOpXposedRe) or Magisk modules. I always manage to find a way, but damn, it’d be SO handy to have an option in MicroG to re-ask for location permission (ideally for both GmsCore and the miscellaneous NLP backends) and save me hours of hassle. :-)

Start by reading the MicroG Settings permission flow and the handling of GmsCore and miscellaneous NLP location backends, using the related UnifiedNlp location issue (#366) for context. Done means providing an in-app option to re-ask for location permission for GmsCore and, ideally, the relevant location backends without requiring ADB or external modules.