[gtk+] progressbar: Don't leave css nodes behind

[Matthias Clasen <matthiasc src gnome org>]

commit 956b2ff998d851c9161dfd231d4f5e1de080346b
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 1 16:00:30 2016 -0500

    progressbar: Don't leave css nodes behind
    
    We create and destroy gadgets inside the hierarchy here,
    and if we don't explicitly remove their CSS nodes from the parent,
    they stick around.

 gtk/gtkprogressbar.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkprogressbar.c b/gtk/gtkprogressbar.c
index ca47e70..352d445 100644
--- a/gtk/gtkprogressbar.c
+++ b/gtk/gtkprogressbar.c
@@ -1516,6 +1516,8 @@ gtk_progress_bar_set_show_text (GtkProgressBar *pbar,
     }
   else
     {
+      if (priv->text_gadget)
+        gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->text_gadget), NULL);
       g_clear_object (&priv->text_gadget);
     }