void gdk_app_launch_context_set_icon_name ( GdkAppLaunchContext* context, const char* icon_name )
Sets the icon for applications that are launched with this context.
icon_name will be interpreted in the same way as the Icon field
in desktop files. See also
icon_name are set, the
icon_name takes priority.
icon_name is set, the icon is taken from either
the file that is passed to launched application or from the
for the launched application itself.