Remove upower_listener

the 'Sleeping' signal has been removed from UPower about four years ago
https://cgit.freedesktop.org/upower/commit/src/org.freedesktop.UPower.xml?id=1ee642e705a63f5ad56a6b55e4bf5c4a64c959b8

gajim/features_window.py

@@ -85,10 +85,6 @@ class FeaturesWindow:
                 _('Ability to request your router to forward port for file transfer.'),
                 _('Requires gir1.2-gupnpigd-1.0.'),
                 _('Feature not available under Windows.')),
-            _('UPower'): (self.upower_available,
-                _('Ability to disconnect properly just before suspending the machine.'),
-                _('Requires upower and python-dbus.'),
-                _('Feature not available under Windows.')),
         }
 
         # name, supported
@@ -186,8 +182,3 @@ class FeaturesWindow:
     def gupnp_igd_available(self):
         return app.HAVE_UPNP_IGD
 
-    def upower_available(self):
-        if os.name == 'nt':
-            return False
-        from gajim import upower_listener
-        return upower_listener.supported

gajim/gui_interface.py

@@ -2853,7 +2853,6 @@ class Interface:
         self.remote_ctrl = None
 
         if dbus_support.supported:
-            from gajim import upower_listener
             from gajim import logind_listener
 
         # Handle gnome screensaver

gajim/upower_listener.py

@@ -1,47 +0,0 @@
-## src/upower_listener.py
-##
-## Copyright (C) 2006-2014 Yann Leboulanger <asterix AT lagaule.org>
-##
-## This file is part of Gajim.
-##
-## Gajim is free software; you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published
-## by the Free Software Foundation; version 3 only.
-##
-## Gajim is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-## GNU General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
-##
-
-
-supported = False
-
-from gajim.common import dbus_support
-from gajim.common import app
-
-def on_suspend(*args, **kwargs):
-    for name, conn in app.connections.items():
-        if app.account_is_connected(name):
-            conn.old_show = app.SHOW_LIST[conn.connected]
-            st = conn.status
-            conn.change_status('offline', _('Machine going to sleep'))
-            conn.status = st
-            conn.time_to_reconnect = 5
-
-if dbus_support.supported:
-    try:
-        from gajim.common.dbus_support import system_bus
-        bus = system_bus.bus()
-        if 'org.freedesktop.UPower' in bus.list_names():
-            up_object = bus.get_object('org.freedesktop.UPower',
-                '/org/freedesktop/UPower')
-            bus.add_signal_receiver(on_suspend, 'Sleeping',
-                'org.freedesktop.UPower', 'org.freedesktop.UPower',
-                '/org/freedesktop/UPower')
-            supported = True
-    except Exception:
-        pass