watch for start menu changes on MS Windows

[totaam]

https://github.com/gorakhargosh/watchdog supports more platforms than pyinotify so this could be used as a generic replacement.

[totaam]

More of an issue now with lots of deprecation warnings in python3.12

Other alternatives:

• https://github.com/chrisjbillington/inotify_simple
• https://github.com/baskiton/pyfanotify
• https://github.com/mcriley821/PyNotify

[totaam]

Can be done using Gio monitor, just like 6b3403d

[totaam]

The commit above cleans up the file monitoring code to ensure that all the xdg stuff lives in the posix platform module.
It should also work on MS Windows, but even the basic gio example does not:

from gi.repository import Gio, GLib
import os

def directory_changed(monitor, file1, file2, evt_type):
    if os.path.isdir(file2):    #maybe this needs to be file1?
        add_monitor(file2) 
    print("Changed:", file1, file2, evt_type)

def add_monitor(dir):
    gfile = Gio.File.new_for_path(dir)
    monitor = gfile.monitor_directory(Gio.FileMonitorFlags.NONE, None)
    monitor.connect("changed", directory_changed) 

add_monitor('.')

ml = GLib.MainLoop()
ml.run()

Maybe this is not implemented for MS Windows at all?

[totaam]

Solved by using python3-watchdog as backend if present.
This one works on all platforms, reliably too.