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Since we save the sent stanzas in the smacks queue for a
potential replay on connection loss, smacks adds a delay tag.

There is no reason that any Groupchat should be treated as already connected when we sign in.

Some of the Commands have security implications, thats why we disable them per default
Fixes #8378

If the user had an empty `file_transfer_proxies` config setting
no proxies were used. As we discover the default server proxy ourself the
user should not have to write it to his config setting to make use of it.

- Push Invitation and Decline event much earlier
- Refactor Logic to decide if mediated or not
  Ejabbered 17.03 does add a `jabber:x:conference` namespace into mediated invites which has broken our logic
- Dont add a groupchat contact on invitation, always add the inviter to the roster

Network link status detection with systemd-networkd

See merge request !86

Logs.db is always at data_root, even if we set another config directory with -c

HistoryManager was not finding the Logs.db when Gajim was used
with the -c config path argument

The systemd-networkd uses another D-Bus interface and different messages
than Network Manager.

Put the common code for connection update in one function, what makes it
more reusable.

For better abstraction, because this module should handle more then
Network Manager.

Fixes #8532

https://xmpp.org/extensions/xep-0184.html#what tells us that we
SHOULD NOT impute any meaning to the fact that we did not receive an ack message

- We want to send requests also to offline contacts.
- The XEP is wide spread chances are high that a contact supports it.
- It gets really complicated, when we want to guess if a offline contact supports receipts

Improvements for sending messages to ourself

See merge request !69

Display OOB content, even without <body/>

See merge request !79

Allow preferences window to shrink

See merge request !81

Previously, it would always be the size needed to fit the largest
page from the notebook.  This is death on small-screen devices like
the pocketCHIP.

Just adding a ScrolledWindow allows is to get smaller (at least
vertically, which is the main issue).  However, we want to still be a
nice size on large screens.  So, we ask each page in the notebook how
tall it wishes to be, and default the window to the tallest one (plus
the size of the extra controls).  However, if the screen is shorter than
this, we do not allow the default window size to exceed the screen size.

Because of the large amount of re-indentation in the XML file, it is
suggested to view this diff with `-b`

Also, if the OOB URL is identical to the entire contents of a <body/>,
no reason to show both.

Closes #8521

Fix IBB

See merge request !76

Improve carbon handling of MUC-PM messages

See merge request !78

Additionally remove all previous Events if we receive a Sent-Carbon,
because we know the user answered from another device

Previously they were shown as 'incoming', when they
should correctly show as 'outgoing'

Fix some PGP issues

See merge request !75

- Move handling of Data IQs into IBBIqHandler
- Call SendHandler with file_props
- Save last sent id in file_props.syn_id
- Remove some useless checks, now that we call SendHandler with file_props
- Send item-not-found error on invalid session id

python-gnupg uses latin1 as default encoding because GPG itself uses
latin1 as default.
We should not override this default with getpreferredencoding, because
getpreferredencoding maybe returns something else than what GPG is configured
on that system.

Example: On Windows
GPG is run in default mode with 'latin1'
getpreferredencoding returns 'cp1252'

The approach would be now to default to latin1 as it is GPGs default.
And if the User sets a different ecoding for GPG he has to set it in
Gajim aswell.