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* meson_options.txt: Added option librem5-hack, defaults to true
* src/meson.build: Added conditional define USE_UGLY_CODE which will be
  set when librem5-hack option is used
* src/calls-call-display.c: ifdef'ed ugly_hacks call

Signed-off-by: Julian Sparber <julian@sparber.net>

This classes where fully replaced by Manager

The manager is a central place for handling data e.g. calls history and
provider managment.

This introduces only the base for feature work. Therefore it manages
only the provider for now, but the manager isn't yet used anywhere.

The propagets events from the provider and origins. It also adds a new
signal called `error`. The `error` signal should be emited only when
something went wrong and we need to inform the user about it, containing
the message to be displayed to the user. Windows should connect to the
event and display a in-app-notification on error. This event isn't
emitted, because the plugins don't give us a usable error.

HdyDialer was deprecated and therefore is replaced with HdyKeypad.
HdyDialer used a `gchr *` to store the entered phone number. On every
button press the entire text of the display entry was replaced with the new
string, which messed up selection and cursor position.
HdyKeypad connects directly to a GtkEntry and inserts each
button press the same way as a keyboard stroke would do.

In the case of the `call display` entry every new digit is appended to the
end of the input and therefore it also moves the cursor to the end of the
entry. Instead of making the Entry not editable, only the events which
would remove text form the entry are blocked, via the `delete-text`
signal. And the signal `insert-text` is used to block unwanted chars
from beeing inserted.

Same as for the `call display` entry also the `new call box` entry is
made editable and the signal `insert-text` is used to block unwanted
chars. All other user action possible on a entry arn't blocked
e.g. repositioning the cursor.

The advantage of making the Entry editable is that we can show
the cursor position.
It also allows the user to select the position where new digits are
inserted in the `new call box`.
On a button press the focus is set to the Entry to give the correct
feedback to the user.

This centers the text on the entry, as required by the design.
This also makes the delete button remove only one char at the time, to
move closer to the desired UX.
Related: Librem5/calls#58

Fixes: Librem5/calls#82

We change the code for dealing with contacts quite significantly,
adding a new class, CallsBestMatch, in order to encapsulate a lot of
the functionality that was in CallsCallRecordRow.

At present avatars are not rounded and there are no auto-generated
avatars for contacts with no avatar.  This work is awaiting discussion
of Apps_Issues#164.

This works around the deprecation warning for HdyDialer.

The CallsBestMatchView and CallsPhoneNumberQuery classes are written
in Vala because they may be generally useful and to leave open the
possibility of adding them to libfolks itself, which is written in
Vala.

Closes #41

We can use GtkApplication to register with the GNOME session rather
than doing it ourselves, simplifying things in CallsApplication very
slightly and allowing us to remove session.{c,h}.

Hat tip to Guido for the session.{c,h} files.

Closes #45

Closes #73

Closes use-cases#113
Closes use-cases#115

Closes use-cases#114

And add missing HDY type ensures.

* Make the Answer button look nice and laid out properly.
* Merge the time and status labels, displaying simply the text
  "Calling..." until the call becomes active and then the call time
  afterwards.
* Fix info display bar in both the call and main windows so they use a
  GtkRevealer and work a lot better.
* Add a "new-call-symbolic" icon for the "Add call" button.
* General tweaks and clean-ups

Closes #55
Closes #35

This is an initial, static implementation of plugins.  The
CallsApplication has a plugin name which can be changed with a new
--provider command line option.  This plugin name is used to
instantiate the appropriate plugin when the application is activated.
From then on, the plugin cannot change.

In future, we can expand this support to include loading multiple
plugins at once, configurable through some UI.  This will have
far-reaching implications though, and complicate things like
enumerating the provider hierarchy.  There is also no practical
benefit right now; the mm and ofono plugins can't be used at the same
time because ModemManager and oFono don't play nice together, and the
whole raison d'être of the dummy plugin is undermined if you can make
use of one of the others.  So for now, we just implement one static
plugin.

Closes #3.

This will be needed by the next commit to display an "About" dialog via
the corresponding entry in the app menu that will be added.

This also adds the PACKAGE_URL, PACKAGE_VERSION and VCS_TAG
configuration data.

This will be used to factorize project-related information like APP_ID.

This will be used in the next commit to let a call display indicate
whether the call is encrypted or not.

Largely cribbed from libhandy, thanks due to Guido.

* Preliminary documentation of CallsCall and CallsMessageSource
* Documentation and cleaning up of CallsCallData
* Add data files and meson rules to create gtk-doc documentation
* Move some macros from util.h to calls-message-source.h