Unify qubes-os XDG config directory

fixes: QubesOS/qubes-issues#8694
Removing space and upper-case letters from qubes-manager configuration
directory. Migrating old config to new unified config directory.

qubesmanager/utils.py

@@ -32,6 +32,9 @@
 import qasync
 from qubesadmin import events
 from qubesadmin import exc
+import xdg.BaseDirectory
+import pathlib
+import shutil
 
 from PyQt5 import QtWidgets, QtCore, QtGui  # pylint: disable=import-error
 
@@ -49,6 +52,28 @@
 # - just a list, no properties or defaults, just a nice list with a "current"
 #       value - initialize_widget
 
+def set_organization():
+    """set the organization and config home directory for Qt based Apps."""
+    # migrate old config file to the unified config directory
+    # TODO: remove the below block when Qubes R4.3 becomes End-of-Life
+    old_config_home = xdg.BaseDirectory.xdg_config_home + \
+        '/The Qubes Project'
+    new_config_home = xdg.BaseDirectory.xdg_config_home + '/qubes-os'
+    config_file = 'qubes-qube-manager.conf'
+    old_config_file = old_config_home + '/' + config_file
+    new_config_file = new_config_home + '/' + config_file
+    if os.path.isfile(old_config_file) and \
+            not os.path.isfile(new_config_file):
+        pathlib.Path(new_config_home).mkdir(parents=True, exist_ok=True)
+        shutil.copy(old_config_file, new_config_file)
+
+    QtCore.QCoreApplication.setOrganizationName('qubes-os')
+    QtCore.QCoreApplication.setOrganizationDomain('qubes-os.org')
+    QtCore.QCoreApplication.setApplicationName('qubes-qube-manager')
+
+# Set organization and config diractory at Module level rather than Applications
+set_organization()
+
 def is_internal(vm):
     """checks if the VM is either an AdminVM or has the 'internal' features"""
     try: