通过命令行运行时打开一个空白窗口。提示：
$ flatpak run io.geph.GephGui
Note that the directories
'/var/lib/flatpak/exports/share'
'/home/thor/.local/share/flatpak/exports/share'
are not in the search path set by the XDG_DATA_DIRS environment variable, so
applications installed by Flatpak may not appear on your desktop until the
session is restarted.
Nov 28 22:40:17.210 DEBUG gephgui_wry: Logging configured!
Nov 28 22:40:17.211 DEBUG agent_thread{id=0}: isahc::agent: agent took 158.609µs to start up
Gtk-Message: 22:40:17.217: Failed to load module "unity-gtk-module"
Gtk-Message: 22:40:17.252: Failed to load module "canberra-gtk-module"
Gtk-Message: 22:40:17.253: Failed to load module "canberra-gtk-module"
Nov 28 22:40:17.331 INFO gephgui_wry: Wry has started!
(gephgui-wry:2): GLib-GIO-CRITICAL **: 22:40:17.334: g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
Gtk-Message: 22:40:17.394: Failed to load module "unity-gtk-module"
Gtk-Message: 22:40:17.438: Failed to load module "canberra-gtk-module"
Gtk-Message: 22:40:17.440: Failed to load module "canberra-gtk-module"
(WebKitWebProcess:22): Gdk-WARNING **: 22:40:17.589: The program 'WebKitWebProcess' received an X Window System error.
This probably reflects a bug in the program.
The error was '178'.
(Details: serial 192 error_code 178 request_code 154 (unknown) minor_code 21)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the GDK_SYNCHRONIZE environment
variable to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
Nov 28 22:40:27.316 INFO gephgui_wry: receiving CloseRequested event