of the last successful periodic mail and computes the next start time
as an offset from that successful finish. The ramifications of this
new method is that changing polling interval on an account does not
force delaying all accounts to poll next in the future by the new
interval. Instead, K-9 Mail now adjusts the next poll time based on
what the next poll time should be based on the last poll finish and
the new interval.
Example 1: In the old way, if the old polling interval was 1 hour, and
the next poll was 50 minutes away (10 minutes have passed), and you
changed the interval to 15 minutes, the poll would happen 15 minutes
from now. In the new way, the next poll will happen only 5 minutes
from now, which is 15 minutes since the last poll.
Example 2: In the old way, if the old polling interval was 1 hour, and
the next poll was 10 minutes away (50 minutes have passed), and you
changed the interval to 30 minutes, the poll would happen 30 minutes
from now. The next poll would then happen actually 80 minutes after
the previous poll completed. In the new way, it'll actually happen
immediately, because the time for the next poll, based on the new
schedule, has already passed.
Similar scenarios happen when a loss of network connectivity
occurs. In the old way, polling would resume using the restoration of
connectivity as the starting point. Each time network connectivity
was lost and restored, the next poll would be further delayed. *If
connectivity was lost and restored frequently, a poll might never
happen!* In the new way, the next poll is rescheduled based on the
time of the last successful poll, so will be rescheduled just like it
was before the loss of connectivity. If the time has already been
passed, the poll will happen immediately.
Only reschedule polling and setup pushing when necessary due to
particular setting changes. Makes the K-9 Mail UI much more
responsive to setting changes that do not affect polling and pushing.
The poll schedule is deliberately only rescheduled when the period is
decreased. An increase in period will still allow the next scheduled
check to happen as originally scheduled.
* Add an explicit configuration option for stars
* Replace now-outdated "left handed" widgets config option, now that
select widgets are always on the left.
* since the multi-modality of the message list was now only a "toggle
stars" option, kill that, as it was lots of code and rather redundant
push technology. This provide a layer of safety in case of
misconfiguration (accidentally setting too many folders to push using
classes), which can bog down the device till it is unusable. On a G1,
25 folders is a very large load. Fixes Issue 871.
Also, move some pending commands to the background to make way for
more important user interface activity.
On each IMAP account, the expunge behavior can be set to expunge
messages in a folder as soon as a move or delete is performed on the
folder ("immediately"), each time the folder is polled, or only when
executed manually.
In the Message List, there is now an Expunge action in the option
menu.
In the Folder List, there is now an Expunge action in the context
menu (long-press on the folder).
For IMAP accounts, it is also possible to disable the copying of deleted messages to the
Trash folder, by setting the Trash folder to -NONE-.
Fixes Issue 536.
Separately, in WebDAV accounts, the user can now choose the
server-side equivalents of the special folders, just like for IMAP.
