Problem
=======
gnome-control-center launched with --help or --list won't exit. We can stop it by pressing Ctrl+C.


How to Reproduce
================
% gnome-control-center --help   
Usage:
  gnome-control-center [OPTION...] [PANEL] [ARGUMENT?] - Settings

Help Options:
  -?, --help                 Show help options
  --help-all                 Show all help options
  --help-gtk                 Show GTK+ Options

GTK+ Options
  --class=CLASS              Program class as used by the window manager
  --name=NAME                Program name as used by the window manager
  --gdk-debug=FLAGS          GDK debugging flags to set
  --gdk-no-debug=FLAGS       GDK debugging flags to unset
  --gtk-module=MODULES       Load additional GTK+ modules
  --g-fatal-warnings         Make all warnings fatal
  --gtk-debug=FLAGS          GTK+ debugging flags to set
  --gtk-no-debug=FLAGS       GTK+ debugging flags to unset

Application Options:
  --version                  
  -v, --verbose              Enable verbose mode
  -o, --overview             Show the overview
  -s, --search=SEARCH        Search for the string
  -l, --list                 List possible panel names and exit
  --display=DISPLAY          X display to use

^C
% gnome-control-center --version
gnome-control-center 3.7.92