BaseActivity.java::openAsAccount may be buggy

[nikclayton]

openAsAccount changes the accountManager's activeAccount property, but does not do any of the work that AccountManager.setActiveAccount() does. In particular:

• The current active account is not saved
• The account passed as parameter here goes not have its isActive property set

This is probably a bug, per feedback on https://github.com/tuskyapp/Tusky/pull/3697/files#r1212176622, but needs proper investigation (it's called from a number of places which might depend on this behaviour).

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• Tusky Version: 21

• I searched or browsed the repo’s other issues to ensure this is not a duplicate.