Fix KDE Plasma logout and info for extended logout time (#24)

* Fix KDE Plasma logout

Previous implementation did not save user session on logout.

* Add information for extended logout time

nvidia-settings-460 and nvidia-prime 460 introduced an extended wait as, while switching prime, update-initramfs is invoked. This creates some time where the system updates the initramfs before logout. To prevent people assuming it's freezing, this additional information is needed.

usr/bin/mate-optimus-applet

@@ -124,7 +124,7 @@ def confirm_ignore(*args):
     return Gtk.ResponseType.CANCEL
 
 def confirm_gpu_switch(gpu):
-    message = _('Do you want to switch GPU now?') + ' ' + _('You need to log out and then log back in to switch the GPU to') + ' ' + gpu
+    message = _('Do you want to switch GPU now?') + ' ' + _('You need to log out and then log back in to switch the GPU to') + ' ' + gpu + _('. \n\nLogout may take up to a minute to complete while your system is configured.')
 
     dialog = Gtk.MessageDialog(None, Gtk.DialogFlags.MODAL, Gtk.MessageType.INFO, Gtk.ButtonsType.NONE, message)
     dialog.set_deletable(False)
@@ -147,7 +147,7 @@ def session_logout():
     elif current_desktop.startswith('gnome'):
          subprocess.Popen(["gnome-session-quit", "--logout"])
     elif current_desktop.startswith('kde'):
-        subprocess.Popen(["qdbus", "org.kde.ksmserver", "/KSMServer", "logout", "0", "0", "0"])
+        subprocess.Popen(["qdbus", "org.kde.ksmserver", "/KSMServer", "logout", "0", "3", "3"])
     elif current_desktop.startswith('lxqt'):
         subprocess.Popen(["lxqt-leave", "--logout"])
     elif current_desktop.startswith('x-cinnamon'):