[gnome-characters] SearchProvider: use proper startup notification for launching search

[Giovanni Campagna <gcampagna src gnome org>]

commit 2d2752bebd952ccf208a43fd7e3ec3bef900335f
Author: Giovanni Campagna <scampa giovanni gmail com>
Date:   Tue Mar 3 01:58:08 2015 -0800

    SearchProvider: use proper startup notification for launching search
    
    This code was copied from gnome-weather, which explicitly tries to
    avoid Gdk/Gtk+ in the background service (so that it could be
    one day launched as a user service from systemd). But gnome-characters
    initializes Gtk+ anyway to handle the clipboard, there is no
    reason for degraded operation.
    In particular, this gives a nice spinner while gnome-characters
    starts up (which is almost invisible, but it can become visible
    on a slow disk and cold cache)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745508

 src/searchProvider.js |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/searchProvider.js b/src/searchProvider.js
index 4e11421..5a40c30 100644
--- a/src/searchProvider.js
+++ b/src/searchProvider.js
@@ -17,6 +17,7 @@
 // with Gnome Weather; if not, write to the Free Software Foundation,
 // Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
+const Gdk = imports.gi.Gdk;
 const Gio = imports.gi.Gio;
 const GLib = imports.gi.GLib;
 const Lang = imports.lang;
@@ -116,7 +117,13 @@ const SearchProvider = new Lang.Class({
     },
 
     _getPlatformData: function(timestamp) {
-        return {'desktop-startup-id': new GLib.Variant('s', '_TIME' + timestamp) };
+        let display = Gdk.Display.get_default();
+        let context = display.get_app_launch_context();
+        context.set_timestamp(timestamp);
+
+        let app = Gio.DesktopAppInfo.new('org.gnome.Characters.desktop');
+        let id = context.get_startup_notify_id(app, []);
+        return {'desktop-startup-id': new GLib.Variant('s', id) };
     },
 
     _activateAction: function(action, parameter, timestamp) {