* Start at once on a device marked as your own
On a distant link, opening the app waited on four round trips before the
inbox showed: the app page, the session, the folder list, then the folder.
A trusted device now starts from what it kept:
- the service worker answers an app route from its kept page and fetches a
fresh one behind it; the app checks the server's version at start, and a
reload for a new build puts the new page in place first, so it is not
answered with the old one. Assets of the page just replaced are kept one
build longer for a tab still running it.
- the session's public details, so requests for mail go out before the
server has confirmed the session; the answer replaces it, and a session
that has ended lands on the sign-in form as before.
- the folder list and the first page of up to four recently read folders,
list properties only, so the folders and the inbox paint before any reply
and the folder query does not wait on the folder list. The "folder no
longer exists" check still waits for the server's list.
All of it goes through the storage gate: nothing is written or read on a
device not marked as the reader's own, and signing out clears it.
* Show nothing kept before the session is confirmed
Starting from a kept session put the kept inbox on screen before the
server had said the session was still good; a session that had ended
showed mail and then the sign-in form. The spinner stays until the
server answers, as before.
The kept session is gone -- it existed only to start early. The kept
folder list and rows are still applied, from setAccount, which runs once
the session is confirmed: the inbox paints the moment that answer
arrives, and the folder query goes out then without waiting on the
folder list. An unreachable server lands on the sign-in form as before.
jcoffey
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