Hold scheduler lock during the whole procedure of scheduler starting
and stopping. This ensures that two processes can't get two read locks
in parallel and start loops or send the stop signal twice.
Also remove shutdown channels: it is enough to wait
for the loop handle without receiving a shutdown signal
from the end of the loop.
Assign location.kml message parts to the trash chat,
but return non-trash chat_id so locations are assigned
to the correct chat.
Due to a bug introduced in
7968f55191
previously location.kml messages resulted in
empty message bubbles on the receiver.
* add dc_resend_msgs() to ffi
* add 'resend' to repl
* implement resend_msgs()
* allow only resending if allowed by chat-protection
this means, resending is denied if a chat is protected and we cannot encrypt
(normally, however, we should not arrive in that state)
* allow only resending of normal, non-info-messages
* allow only resending of own messages
* reset sending state to OutPending on resending
the resulting state is always OutDelivered first,
OutMdnRcvd again would be applied when a read receipt is received.
preserving old state is doable, however,
maybe this simple approach is also good enough, at least for now
(or maybe the simple approach is even just fine :)
another thing: when we upgrade to resending foreign messages,
we do not have a simple way to mark them as pending
as incoming message just do not have such a state -
but this is sth. for the future.
The limit on the number of jobs executed in a row was introduced to
prevent large queues of small jobs like MarkseenMsgOnImap, MoveMsg and
DeleteMsgOnImap from delaying message fetching. Since all these jobs
are now removed and IMAP operations they did are now batched, it is
impossible to have 20 or more queued IMAP jobs.
When removing an account, try 60 times with 1 second sleep in between
in case removal of database files fails. This happens on Windows
platform sometimes due to a known bug in r2d2 which may result in 30
seconds delay until all connections are closed [1].
[1] https://github.com/sfackler/r2d2/issues/99
