Previous behaviour: connection with IDLE was stopped every 5 minutes to
poll the other threads. As a result messages received within that time
window when there was no IDLING were never received.
Current behaviour: polling is done in the main connection.
Prepend a cursor movement (Up/Down/PageUp/PageDown) with a multiplier
(e.g 23+Down, that is '2' then '3' then 'Down') to increase the
movement's length.
Account::is_online(&mut self) should be called from ui/src/state.rs
only, since it launches the watcher threads when an account goes from
offline to online. If it's called from elsewhere the watcher threads
might not get launched ever.
Context needs to know when an account gets online in order to get the
mailbox hashes and launch the watcher threads for this account. Instead
of assuming all accounts are online when launching meli, move the
initialisation logic to an is_online() method on Context to do it on
demand.
The is_online() method is then called by ui::components::mail::Listing
everytime it's drawn to check for status changes.
Some events are invalid when there are no messages shown in the listing.
Instead of checking for self.length > 0 in each of these events, put
them together in an if block.
Errors were not shown properly because the data_columns grids were being
overwritten by redraw_list(). Call redraw_list() only if filtering was
succesful.
The backend object stores the state of the backend associated with an
account.
Hide the backend object between a mutex, in order to be able to share it
with threads in the next commit.
The operation() method on the MailBackend trait returns a trait object
that can read or modify an Envelope directly from the backend. This is
used to get eg the envelope's text, or set flags. It has two arguments,
envelope hash and folder hash.
Only the Maildir backend needed the latter argument, and it can be replaced with a dictionary to match envelope hashes to folder hashes within the Maildir backend.
Envelope can now only be accessed from within a RwLock. Two new structs
are introduced: EnvelopeRef and EnvelopeRefMut. These hold a reference
to an Envelope and the mutex guard that keeps them alive.
This change allows sharing of the envelopes hash map amongst threads.
