ibusManager: Spawn ibus-daemon

gnome-settings-daemon doesn't this for us anymore. Note that
ibus-daemon isn't DBus activatable but just spawning it is fine
because it does its own single instance management. The library
notifies us when it shows up and goes away through the connected and
disconnected signals.

https://bugzilla.gnome.org/show_bug.cgi?id=736435

js/misc/ibusManager.js

@@ -1,5 +1,6 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 
+const Gio = imports.gi.Gio;
 const Lang = imports.lang;
 const Signals = imports.signals;
 
@@ -44,6 +45,17 @@ const IBusManager = new Lang.Class({
         // Need to set this to get 'global-engine-changed' emitions
         this._ibus.set_watch_ibus_signal(true);
         this._ibus.connect('global-engine-changed', Lang.bind(this, this._engineChanged));
+
+        this._spawn();
+    },
+
+    _spawn: function() {
+        try {
+            Gio.Subprocess.new(['ibus-daemon', '--xim', '--panel', 'disable'],
+                               Gio.SubprocessFlags.NONE);
+        } catch(e) {
+            log('Failed to launch ibus-daemon: ' + e.message);
+        }
     },
 
     _clear: function() {
@@ -58,6 +70,8 @@ const IBusManager = new Lang.Class({
         this._currentEngineName = null;
 
         this.emit('ready', false);
+
+        this._spawn();
     },
 
     _onConnected: function() {