BluetoothStatus: always update devices

Previously, we skipped rebuilding device items in case the device
had already been seen, but this caused the connected switch not to
be updated. Now it has been refactored to update in case the device
changes, and to create only when the device is completely new.

https://bugzilla.gnome.org/show_bug.cgi?id=647565

js/ui/status/bluetooth.js

@@ -127,13 +127,6 @@ Indicator.prototype = {
         }
     },
 
-    _deviceCompare: function(d1, d2) {
-        return d1.device_path == d2.device_path &&
-            d1.bdaddr == d2.bdaddr &&
-            d1.can_connect == d2.can_connect &&
-            d1.capabilities == d2.capabilities;
-    },
-
     _updateDevices: function() {
         let devices = this._applet.get_devices();
 
@@ -142,12 +135,8 @@ Indicator.prototype = {
             let item = this._deviceItems[i];
             let destroy = true;
             for (let j = 0; j < devices.length; j++) {
-                // we need to deep compare because BluetoothSimpleDevice is a boxed type
+                if (item._device.device_path == devices[j].device_path) {
-                // (but we take advantage of that, because _skip will disappear the next
+                    this._updateDeviceItem(item, devices[j]);
-                // time get_devices() is called)
-                if (this._deviceCompare(item._device, devices[j])) {
-                    item.label.text = devices[j].alias;
-                    devices[j]._skip = true;
                     destroy = false;
                     break;
                 }
@@ -162,7 +151,7 @@ Indicator.prototype = {
         this._hasDevices = newlist.length > 0;
         for (let i = 0; i < devices.length; i++) {
             let d = devices[i];
-            if (d._skip)
+            if (d._item)
                 continue;
             let item = this._createDeviceItem(d);
             if (item) {
@@ -177,17 +166,55 @@ Indicator.prototype = {
             this._deviceSep.actor.hide();
     },
 
+    _updateDeviceItem: function(item, device) {
+        if (!device.can_connect && device.capabilities == GnomeBluetoothApplet.Capabilities.NONE) {
+            item.destroy();
+            return;
+        }
+
+        let prevDevice = item._device;
+        let prevCapabilities = prevDevice.capabilities;
+        let prevCanConnect = prevDevice.can_connect;
+
+        // adopt the new device object
+        item._device = device;
+        device._item = item;
+
+        // update properties
+        item.label.text = device.alias;
+
+        if (prevCapabilities != device.capabilities ||
+            prevCanConnect != device.can_connect) {
+            // need to rebuild the submenu
+            item.menu.removeAll();
+            this._buildDeviceSubMenu(item, device);
+        }
+
+        // update connected property
+        if (device.can_connect)
+            item._connectedMenuitem.setToggleState(device.connected);
+    },
+
     _createDeviceItem: function(device) {
         if (!device.can_connect && device.capabilities == GnomeBluetoothApplet.Capabilities.NONE)
             return null;
         let item = new PopupMenu.PopupSubMenuMenuItem(device.alias);
-        item._device = device;
 
+        // adopt the device object, and add a back link
+        item._device = device;
+        device._item = item;
+
+        this._buildDeviceSubMenu(item, device);
+
+        return item;
+    },
+
+    _buildDeviceSubMenu: function(item, device) {
         if (device.can_connect) {
             item._connected = device.connected;
-            let menuitem = new PopupMenu.PopupSwitchMenuItem(_("Connection"), device.connected);
+            item._connectedMenuitem = new PopupMenu.PopupSwitchMenuItem(_("Connection"), device.connected);
 
-            menuitem.connect('toggled', Lang.bind(this, function() {
+            item._connectedMenuitem.connect('toggled', Lang.bind(this, function() {
                 if (item._connected > ConnectionState.CONNECTED) {
                     // operation already in progress, revert
                     menuitem.setToggleState(menuitem.state);
@@ -217,7 +244,7 @@ Indicator.prototype = {
                 }
             }));
 
-            item.menu.addMenuItem(menuitem);
+            item.menu.addMenuItem(item._connectedMenuitem);
         }
 
         if (device.capabilities & GnomeBluetoothApplet.Capabilities.OBEX_PUSH) {
@@ -263,8 +290,6 @@ Indicator.prototype = {
         default:
             break;
         }
-
-        return item;
     },
 
     _updateFullMenu: function() {