Previously network.py had its own idea of request IDs,
and each interface had its own which was sent on the wire.
The interface would jump through hoops to translate one
to the other.
This unifies them so that a message ID is passed when
queueing a request, in addition to the method and params.
network.py is now solely responsible for message ID management.
Apart from being simpler and clearer, this also should be faster
as there is much less data structure manipulation and rebuilding
happening.
It's long been a pet peeve of mine that whilst editing a label,
something would cause Electrum to refresh the widget, such as
an incoming tx or a new block, and you'd lose your edits.
This changes MyTreeWidget so that, if editing, updates are
deferred until editing finishes.
Gets rid of need for EditableItem class.
New callback on_permit_edit to permit widgets to refuse editing.
Restores popup menu on activating a non-editable column behaviour.
On startup we make several connections simultaneously. Socket
maintenance code checks if we're not connected, and if not
switches to a connected interface if auto_connect.
Unfortunately this meant that we frequently didn't reconnect to
the prior good server on startup, because some other connection
would happen first and this code would decide to switch to it.
Instead, only switch if a connection attempt is not in progress.
If that times out at the O/S level the switch will happen.