Cache the key backup status whether enabled or not #29886
Merged
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Part of #29231
Tidy up key backup status in
DeviceListener
a little, making it easier to find out about key backup status, which we will do in later changes.Includes a small change to behaviour: always cache the answer, instead of only caching it when the answer was
true
. I can't see a way that this will cause problems, but if the reviewer can, it is simple to change it back to only caching positive answers.