Returns a GLib.OptionGroup for the commandline arguments recognized
by GTK+ and GDK.
You should add this group to your GLib.OptionContext
with g_option_context_add_group(), if you are using
g_option_context_parse() to parse your commandline arguments.
Parameters
open_default_display: boolean
whether to open the default display when parsing the commandline arguments
Returns a GLib.OptionGroup for the commandline arguments recognized by GTK+ and GDK.
You should add this group to your GLib.OptionContext with
g_option_context_add_group(), if you are usingg_option_context_parse()to parse your commandline arguments.