https://lists.gnome.org/archives/gtkmm-list/2015-March/msg00018.html
Wrapping GApplication inside Gtk module
wrappinginsidegtkmodule
https://gnome.pages.gitlab.gnome.org/glib/coverage/gio/gapplication-tool.c.gcov.html
LCOV - unnamed - gio/gapplication-tool.c
lcovunnamedgiotool
https://mail.gnome.org/archives/commits-list/2010-May/msg05455.html
[glib/wip/gapplication: 1/5] Add GApplication
glibwipadd