The default layout showed only the newest message of a thread in the
reader and unfolded the rest as rows inside the list. The reader now
shows the conversation on every layout but a phone's, as Mountain View
does: older messages folded to one line each, unread ones unfolded, the
newest open. A conversation is one row in the list, with no chevron,
and `x` no longer unfolds it. "Show emails as individual messages"
keeps the single message.
Two existing tests changed their setup, not their assertions: the
attachment download tests in `blob-routing.test.tsx` turn threading off
so the conversation fetch doesn't take the requests they count, and the
`x` expansion tests now run on Mountain View on a tablet, the one place
where the list still unfolds a conversation.
Linus Rath
8bfc7cf8e0