[gnome-boxes] display-page: No need to show an already shown widget

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 4815e3912208609930c8f57e3a378b44ce2ed897
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Fri Jul 20 03:34:51 2012 +0200

    display-page: No need to show an already shown widget
    
    https://bugzilla.gnome.org/show_bug.cgi?id=680293

 src/display-page.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/display-page.vala b/src/display-page.vala
index 6b62500..bdeb03e 100644
--- a/src/display-page.vala
+++ b/src/display-page.vala
@@ -200,6 +200,9 @@ private class Boxes.DisplayPage: GLib.Object {
     }
 
     public void show_display (Boxes.Display display, Widget widget) {
+        if (event_box.get_child () == widget)
+            return;
+
         remove_display ();
 
         this.display = display;