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.
Previously we used a separator in the middle of the main toolbar and extended the width of the HeaderBar in order to
special case for Ambiance.
Ambiance is no longer the default Ubuntu theme, and sticking
with GNOME design patterns should be prioritized over
special casing with a theme.
Fixes https://gitlab.gnome.org/GNOME/geary/issues/389
Using show_all is a pita, since it causes a bunch of bugs whenever we
need to conditionally show/hide widgets. This removes all uses on the
main window in favour of either just show() or present(), and ensures
that its widgets that are shown by default, are shown by default.
* Ported Gtk.Action to GLib.Action in the GearyController.
* Removed Gtk.AccelGroups (handled through Gtk.Application now).
* Got rid of Gtk.UiManager (now all is done through Gtk.Builder).
* Throw away workaround for conflicting Gtk.Actions in ComposerContainer.
* Aggregate zoom in/out/normal into one parameterized zoom action.
Signed-off-by: Niels De Graef <nielsdegraef@gmail.com>
