Fixes from the review of the desktop import.
- A message another program holds is no longer recorded as deleted. Only a
real absence moves the import past it; anything else is tried again and
then reported as a failure, and the next run reads it.
- A resume that can't read some folders names them in a toast with a choice
to stop trying, keeps the job open and retries only those at the next start.
Files chosen by hand in the same dialog are named, since they can't come
back by themselves.
- A wipe or sign-out releases the job in the shell before the record goes.
Leaving the dialog without starting releases the confirmed files. Job
records are per account, and a start is refused while another window holds
that account's job.
- Dedupe goes by the bytes without state headers: a reused Message-ID of the
same length dropped a real message. Older records still count, so nothing
goes in twice.
- A lost connection on a folder or Email/import pauses instead of counting
towards the failures that stop an import.
- The taskbar goes through `lib/desktop/taskbar-progress.ts`.
Test changes: the taskbar test now renders the host, because its helper in
`local-import-job.ts` is gone, and the dedupe tests use `check`, which replaced
`keyFor` and `has`.
The import dialog in the desktop app can now find Thunderbird profiles and
Outlook PST files, show what it found and import what the user confirms.
Browsers behave as before.
- The bridge's `localImport` gives opaque handles and range URLs. The shell
asks natively before it looks, before it reads and before it goes on after
a restart.
- `lib/mail-import` gets a Maildir source and a per-file `folder`, so
Thunderbird's `.sbd` tree maps onto the account's folders. The PST worker
reads through a synchronous range XHR when there is no Blob.
- What was imported is remembered by Message-ID and size per folder, because
compacting a folder changes its checkpoint key and Email/import doesn't
dedupe. It runs from the dialog and on a resume.
- The job's record lives in IndexedDB, since Chromium writes localStorage too
late to survive a kill. Windows wait for the job's lock, so one takes over
when another goes.
- The desktop dialog says how long an import takes at the upload limit, warns
when Thunderbird is running, and turns down .ost files with the reason.
The engine used to be able to lose an import while offline: uploadBlob kept
the file on this device under a stand-in id and reported success. It now
passes `noHold`, Email/import is network only, an offline spell pauses without
using up a message's tries, and a device-only client stops at once. The same
fix applies to imports in the browser.
A message that failed for a passing reason (a dropped connection, a
server error, an expired token) used to count as done, so continuing
the import skipped it for good, and a slow upload followed by a cancel
imported the messages after it twice.
- The checkpoint keeps every message that is done, also past a gap,
and the next run of the same import tries only the rest again.
- Ten failures in a row, a full mailbox (overQuota) or a refusal
(forbidden) stop the import with a message instead of going through
the whole file.
- An upload without an answer pauses the import instead of failing the
message: 30 seconds, then until the upload window ends.
- Email/import, the export's Blob/get and folder listing pass the
client's own 429 pause by, and a 429 on them doesn't pause the rest
of the app.
- Signing out stops the job of that account only, writes no checkpoint
and imports nothing more afterwards; another account's sign-out
leaves the job alone.
- One tab imports a file at a time (Web Locks), and Import waits until
the dialog knows whether an earlier run can be continued.
The import dialog tests now wait for the Import button to be enabled
before clicking it, since it stays off during that lookup.
Linus Rath