Part of https://gitlab.gnome.org/GNOME/Initiatives/issues/1;
Sets up dual installation for flatpaks, allowing us to
build and run geary without affecting our system install.
This will allow testing of nightlies and CI artifacts as well
via the flatpak, so we can iterate on designs and share
bundles to test with.
* org.gnome.Geary.service.in: create, and let it be installed by CMake.
* org.gnome.Geary.desktop.in: add `DBusActivatable=true`.
* geary-autostart.desktop.in: use `--gapplication-service` instead of
hidden.
* Change the way arguments are parsed:
* Use the _command-line_ and _handle-local-options_ signals instead
of _local-command-line_.
* Remove the `--hidden` option (replaced by `--gapplication-service`)
* Use VariantDict (which is a little cleaner)
* Don't use global variables in Arg, but set them in
the config instead.
* We can no longer set a global summary due to the new option handling
in GApplication. On IRC, I got the feedback that info like this should
be going into a manpage.
* Since the QUIT-action can now be called without ever activating the
app, make the necessary changes to the `GearyController`:
* `main_window` and `current_conversations` can be null.
* use `pending_mailtos()` for the compose action as well.
* Don't update the UNDO action if we're closing down.
* More instance variables prefixed with this (we're changing the lines
anyway, might as well do it properly).
* `Environment.set_prgname()` is already executed in GApplication.run(),
so no more need for `GearyApplication.PRGNAME`.
Signed-off-by: Niels De Graef <nielsdegraef@gmail.com>
