docs: add a short discussion of how battery icons work
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@ -96,6 +96,23 @@ no way to force an update of the cached information besides terminating
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Solaar and starting it again.
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## Battery Icons
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For many devices, Solaar shows the approximate battery level via icons that
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show up in both main Solaar window and the system tray. Solaar used to use
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several heuristics to determine which icon names to use for this purpose,
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but as more and more battery icon schemes have been developed this has
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become impossible to do well. Solaar now only uses the eleven standard
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battery icon names `battery-{full,good,low,critical,empty}[-charging]` and
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`battery-missing`. To use different icons from you have to change (part of)
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your GTK icon theme.
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Solaar is not using the symbolic versions of these icons because of a bug
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external to Solaar that results in these icons not changing to the
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foreground colour in the system tray. This can leave these icons nearly
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invisible in dark themes.
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[solaar]: https://github.com/pwr-Solaar/Solaar
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[logitech]: https://www.logitech.com
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[unifying]: https://en.wikipedia.org/wiki/Logitech_Unifying_receiver
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