[gnome-shell] shell-info: Use transient notifications

[Florian Müllner <fmuellner src gnome org>]

commit eef194c3aac3a66f93bf7cb677fdad51661faed5
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Dec 16 22:34:39 2010 +0100

    shell-info: Use transient notifications
    
    According to the designers, system notifications should be transient;
    so now that transient notifications are supported properly, make use
    of it instead of using a timeout to remove the associated source.

 js/ui/overview.js |   20 ++------------------
 1 files changed, 2 insertions(+), 18 deletions(-)
---
diff --git a/js/ui/overview.js b/js/ui/overview.js
index 21ca951..4c3e21c 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -28,7 +28,6 @@ const ANIMATION_TIME = 0.25;
 // We split the screen vertically between the dash and the view selector.
 const DASH_SPLIT_FRACTION = 0.1;
 
-const SHELL_INFO_HIDE_TIMEOUT = 10;
 
 function Source() {
     this._init();
@@ -61,14 +60,10 @@ function ShellInfo() {
 ShellInfo.prototype = {
     _init: function() {
         this._source = null;
-        this._timeoutId = 0;
         this._undoCallback = null;
     },
 
     _onUndoClicked: function() {
-        Mainloop.source_remove(this._timeoutId);
-        this._timeoutId = 0;
-
         if (this._undoCallback)
             this._undoCallback();
         this._undoCallback = null;
@@ -77,20 +72,7 @@ ShellInfo.prototype = {
             this._source.destroy();
     },
 
-    _onTimeout: function() {
-        this._timeoutId = 0;
-        if (this._source)
-            this._source.destroy();
-        return false;
-    },
-
     setMessage: function(text, undoCallback, undoLabel) {
-        if (this._timeoutId)
-            Mainloop.source_remove(this._timeoutId);
-
-        this._timeoutId = Mainloop.timeout_add_seconds(SHELL_INFO_HIDE_TIMEOUT,
-                                                       Lang.bind(this, this._onTimeout));
-
         if (this._source == null) {
             this._source = new Source();
             this._source.connect('destroy', Lang.bind(this,
@@ -106,6 +88,8 @@ ShellInfo.prototype = {
         else
             notification.update(text, null, { clear: true });
 
+        notification.setTransient(true);
+
         this._undoCallback = undoCallback;
         if (undoCallback) {
             notification.addButton('system-undo',