--- src/wingpanel/src/PanelWindow.vala	2016-10-21 23:51:49.434036000 +0900
+++ src/wingpanel/src/PanelWindow.vala.new	2016-10-22 00:21:00.991151961 +0900
@@ -86,7 +86,7 @@
     private void on_realize () {
         update_panel_dimensions ();
 
-        Services.BackgroundManager.initialize (this.monitor_number, panel_height);
+        //Services.BackgroundManager.initialize (this.monitor_number, panel_height);
 
         timeout = Timeout.add (100 / panel_height, animation_step);
     }
@@ -152,7 +152,7 @@
 
     public void set_expanded (bool expanded) {
         if (expand && !this.expanded) {
-            Services.BackgroundManager.get_default ().remember_window ();
+            //Services.BackgroundManager.get_default ().remember_window ();
 
             this.expanded = true;
 
@@ -163,7 +163,7 @@
 
             this.set_size_request (monitor_width, monitor_height);
         } else if (!expand) {
-            Services.BackgroundManager.get_default ().restore_window ();
+            //Services.BackgroundManager.get_default ().restore_window ();
 
             this.expanded = false;
 
--- src/wingpanel/src/Widgets/Panel.vala	2016-10-22 00:14:45.485792472 +0900
+++ src/wingpanel/src/Widgets/Panel.vala.new	2016-10-22 00:15:13.386112571 +0900
@@ -60,7 +60,7 @@
 
         style_context = this.get_style_context ();
 
-        Services.BackgroundManager.get_default ().background_state_changed.connect (update_background);
+        //Services.BackgroundManager.get_default ().background_state_changed.connect (update_background);
     }
 
     private void add_indicator (Indicator indicator) {
@@ -102,7 +102,7 @@
         }
     }
 
-    private void update_background (Services.BackgroundState state, uint animation_duration) {
+    /* private void update_background (Services.BackgroundState state, uint animation_duration) {
         if (style_provider == null) {
             style_provider = new Gtk.CssProvider ();
             style_context.add_provider (style_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
@@ -146,5 +146,5 @@
                 style_context.remove_class ("maximized");
                 break;
         }
-    }
+    } */
 }
--- src/wingpanel/src/CMakeLists.txt	2017-10-13 03:28:23.119421691 +0900
+++ src/wingpanel/src/CMakeLists.txt.new	2017-10-13 03:30:12.838158479 +0900
@@ -10,7 +10,6 @@
   Services/IndicatorSorter.vala
   Services/PopoverManager.vala
   Services/Settings.vala
-  Services/BackgroundManager.vala
 )
 
 vala_precompile (CLIENT_VALA_C ${CMAKE_PROJECT_NAME}
--- src/wingpanel/src/Services/BackgroundManager.vala	2018-03-04 00:30:27.781440874 +0900
+++ /dev/null	2018-03-03 20:05:09.041298375 +0900
@@ -1,133 +0,0 @@
-/*
- * Copyright (c) 2011-2015 Wingpanel Developers (http://launchpad.net/wingpanel)
- *
- * This program 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; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program 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 this program; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301 USA.
- */
-
-namespace Wingpanel.Services {
-    public enum BackgroundState {
-        LIGHT,
-        DARK,
-        MAXIMIZED,
-        TRANSLUCENT_DARK,
-        TRANSLUCENT_LIGHT
-    }
-
-    [DBus (name = "org.pantheon.gala.WingpanelInterface")]
-    public interface InterfaceBus : Object {
-        public signal void state_changed (BackgroundState state, uint animation_duration);
-
-        public abstract void initialize (int monitor, int panel_height) throws IOError;
-        public abstract void remember_focused_window () throws IOError;
-        public abstract void restore_focused_window () throws IOError;
-    }
-
-    public class BackgroundManager : Object {
-        private const string DBUS_NAME = "org.pantheon.gala.WingpanelInterface";
-        private const string DBUS_PATH = "/org/pantheon/gala/WingpanelInterface";
-
-        private static BackgroundManager? instance = null;
-
-        private InterfaceBus? bus = null;
-
-        private BackgroundState current_state = BackgroundState.LIGHT;
-        private bool use_transparency = true;
-
-        private bool bus_available {
-            get {
-                return bus != null;
-            }
-        }
-
-        private int monitor;
-        private int panel_height;
-
-        public signal void background_state_changed (BackgroundState state, uint animation_duration);
-
-        public static void initialize (int monitor, int panel_height) {
-            var manager = BackgroundManager.get_default ();
-            manager.monitor = monitor;
-            manager.panel_height = panel_height;
-        }
-
-        private BackgroundManager () {
-            PanelSettings.get_default ().notify["use-transparency"].connect (() => {
-                use_transparency = PanelSettings.get_default ().use_transparency;
-                state_updated ();
-            });
-
-            use_transparency = PanelSettings.get_default ().use_transparency;
-
-            Bus.watch_name (BusType.SESSION, DBUS_NAME, BusNameWatcherFlags.NONE,
-                () => connect_dbus (),
-                () => bus = null);
-        }
-
-        public void remember_window () {
-            if (!bus_available) {
-                return;
-            }
-
-            try {
-                bus.remember_focused_window ();
-            } catch (Error e) {
-                warning ("Remembering focused window failed: %s", e.message);
-            }
-        }
-
-        public void restore_window () {
-            if (!bus_available) {
-                return;
-            }
-
-            try {
-                bus.restore_focused_window ();
-            } catch (Error e) {
-                warning ("Restoring last focused window failed: %s", e.message);
-            }
-        }
-
-        private bool connect_dbus () {
-            try {
-                bus = Bus.get_proxy_sync (BusType.SESSION, DBUS_NAME, DBUS_PATH);
-                bus.initialize (monitor, panel_height);
-            } catch (Error e) {
-                warning ("Connecting to \"%s\" failed: %s", DBUS_NAME, e.message);
-                return false;
-            }
-
-            bus.state_changed.connect ((state, animation_duration) => {
-                current_state = state;
-                state_updated (animation_duration);
-            });
-
-            state_updated ();
-            return true;
-        }
-
-        private void state_updated (uint animation_duration = 0) {
-            background_state_changed (use_transparency ? current_state : BackgroundState.MAXIMIZED, animation_duration);
-        }
-
-        public static BackgroundManager get_default () {
-            if (instance == null) {
-                instance = new BackgroundManager ();
-            }
-
-            return instance;
-        }
-    }
-}