GVolumeMonitor: Results don't reflect current state but state when application was launched

Submitted by Christian Stadelmann @genodeftest

Link to original bug (#759644)

Description

Created attachment 317639 A sample C file to test bug.

Steps to reproduce:

1. open python, $ python3
2. run from gi.repository import Gio
3. run [m.get_name() for m in Gio.VolumeMonitor.get().get_mounts()]. This will give you a list of all mounted partitions.
4. mount or unmount a partition. Make sure that it shows up e.g. in nautilus.
5. run command [m.get_name() for m in Gio.VolumeMonitor.get().get_mounts()] again.

What happens: List of mounts has not changed

What should happen: List of mounts should always reflect the current state, not the state when it was initialized first.

Additional info: This issue is not specific to python. It can be easily reproduced with attached code. This issue seems to affect get_volumes() and get_connected_drives() too.

Attachment 317639, "A sample C file to test bug.":
main.c

Version: 2.52.x