Excluding switched-off calendars from the event form's picker is right for
*targets*, but it also dropped the calendar an event already lives in. Editing
an event of a writable calendar switched off on this device (from a widget, a
deep link, another app's ACTION_EDIT) rendered the calendar row as the red "no
calendar" error, with the picker still enabled — so any pick turned the save
into a calendar move nobody asked for. The event's own calendar is added back
whenever it isn't among the targets, the way the managed special-dates case
already did; a calendar the app may not write to is still no target.
Settings → Notifications had missed the same predicate swap: it kept offering
per-calendar reminder overrides for switched-off calendars, where the provider
schedules no alarms and the setting could never fire.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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