GAppInfoMonitor for the current thread-default main context.
GAppInfoMonitor will emit a “changed” signal in the
thread-default main context whenever the list of installed
applications (as reported by g_app_info_get_all()) may have changed.
You must only call
g_object_unref() on the return value from under
the same main context as you created it.
A reference to a
|The caller of the function takes ownership of the data, and is responsible for freeing it.|