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

[Matthias Clasen <matthiasc src gnome org>]

commit 577783a19db6f45deb732be6e24724c7cfeb28c0
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 1 15:57:36 2016 -0500

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

 gtk/gtkscale.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkscale.c b/gtk/gtkscale.c
index ab49746..33e5199 100644
--- a/gtk/gtkscale.c
+++ b/gtk/gtkscale.c
@@ -1869,8 +1869,12 @@ gtk_scale_mark_free (gpointer data)
 {
   GtkScaleMark *mark = data;
 
+  if (mark->label_gadget)
+    gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->label_gadget), NULL);
   g_clear_object (&mark->label_gadget);
+  gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->indicator_gadget), NULL);
   g_object_unref (mark->indicator_gadget);
+  gtk_css_node_set_parent (gtk_css_gadget_get_node (mark->gadget), NULL);
   g_object_unref (mark->gadget);
   g_free (mark->markup);
   g_free (mark);
@@ -1896,7 +1900,11 @@ gtk_scale_clear_marks (GtkScale *scale)
   g_slist_free_full (priv->marks, gtk_scale_mark_free);
   priv->marks = NULL;
 
+  if (priv->top_marks_gadget)
+    gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->top_marks_gadget), NULL);
   g_clear_object (&priv->top_marks_gadget);
+  if (priv->bottom_marks_gadget)
+    gtk_css_node_set_parent (gtk_css_gadget_get_node (priv->bottom_marks_gadget), NULL);
   g_clear_object (&priv->bottom_marks_gadget);
 
   _gtk_range_set_stop_values (GTK_RANGE (scale), NULL, 0);