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

[Matthias Clasen <matthiasc src gnome org>]

commit cb614cc8388bfde71928bbc29fe45456d216c154
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 1 15:48:01 2016 -0500

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

 gtk/gtkrange.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index bbfd3bc..c8d6129 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -1568,6 +1568,7 @@ gtk_range_set_show_fill_level (GtkRange *range,
     }
   else
     {
+      gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->fill_gadget), NULL);
       g_clear_object (&priv->fill_gadget);
     }
 
@@ -3807,6 +3808,7 @@ _gtk_range_set_has_origin (GtkRange *range,
     }
   else
     {
+      gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->highlight_gadget), NULL);
       g_clear_object (&priv->highlight_gadget);
     }
 }
@@ -3917,7 +3919,10 @@ sync_stepper_gadget (GtkRange                *range,
   if (!should_have_stepper)
     {
       if (*gadget_ptr != NULL)
-        gtk_box_gadget_remove_gadget (GTK_BOX_GADGET (priv->contents_gadget), *gadget_ptr);
+        {
+          gtk_css_node_set_parent (gtk_css_gadget_get_node (*gadget_ptr), NULL);
+          gtk_box_gadget_remove_gadget (GTK_BOX_GADGET (priv->contents_gadget), *gadget_ptr);
+        }
       g_clear_object (gadget_ptr);
       return;
     }