[gtk+] notebook: Don't unparent tab label for drag

[Benjamin Otte <otte src gnome org>]

commit 6d5edd18cf5637274762b7a51488d27d5bed600d
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jan 9 14:25:26 2016 +0100

    notebook: Don't unparent tab label for drag
    
    When a tab drag starts, we need to move the tab label into the drag
    window via gtk_widget_set_parent_window().
    If we don't unparent, but just unrealize the widget, we don't lose the
    cssnode position.

 gtk/gtknotebook.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtknotebook.c b/gtk/gtknotebook.c
index 04455f6..426281f 100644
--- a/gtk/gtknotebook.c
+++ b/gtk/gtknotebook.c
@@ -2977,9 +2977,10 @@ show_drag_window (GtkNotebook        *notebook,
     }
 
   g_object_ref (page->tab_label);
-  gtk_widget_unparent (page->tab_label);
+  gtk_widget_set_child_visible (page->tab_label, FALSE);
+  gtk_widget_unrealize (page->tab_label);
   gtk_widget_set_parent_window (page->tab_label, priv->drag_window);
-  gtk_widget_set_parent (page->tab_label, widget);
+  gtk_widget_set_child_visible (page->tab_label, TRUE);
   g_object_unref (page->tab_label);
 
   /* the grab will dissapear when the window is hidden */