The picker opened on "No contacts in this address book" -- about an
address book with contacts in it. Nothing was wrong with the button, and
that is why it read as one: it opened, correctly, onto nothing.
Contacts are fetched on demand. `loadAll` runs when the Contacts view
mounts, and `suggest` kicks it off itself, which is why autocomplete has
always worked from anywhere. The picker did neither, so opening a
composer without having visited Contacts first -- which is most of the
time, and every time in a fresh tab -- showed an empty list over a full
account. Anyone who had been to Contacts that session saw it work, which
is the sort of difference that reads as browser-specific when it is not.
It asks for them now, and says it is loading rather than that there are
none.
While here: the picker decided which shared books to offer on
`isSubscribed` alone. Stalwart refuses that flag on a book shared
read-only, so those are recorded in settings instead -- for an address
book it is the *only* record -- and filtering on the server's flag left
every shared book out of the picker while the sidebar showed it. Both now
ask the same question.
Verified against the mock from a genuinely cold store -- cards emptied,
`loaded` false, opening the picker as the first thing that wants them:
eight rows, from the reader's own book and a shared one, where before
there were none.