c19a51bec4
So far we assumed every power source was a battery except for the ones which definitely are not. I think this logic makes little sense, as "battery" is kinda the exceptional case here, not the other way round. Hence let's invert the type check, and denylist "Battery" devices rather than allowlist "Mains" devices. This should increase compatibility with alternative types of power sources, in particular USB ones. This takes into account that additional power types have been added since we wrote the original code, and in particular should cover the siutation discussed here OK: https://sources.debian.org/src/powermgmt-base/1.36/power_supply.txt/#L31 https://sources.debian.org/src/powermgmt-base/1.36/on_ac_power/#L25 Also, modernizes the code in various was ways. Inspired by and fixes: #20964
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