[gtk+/gtk-3-22] listbox: Manually unparent placeholder in dispose

[Matthias Clasen <matthiasc src gnome org>]

commit 73179d377145c5ab6bbf8a84d03f752b3359e7d9
Author: Timm Bäder <mail baedert org>
Date:   Thu May 11 15:33:13 2017 +0200

    listbox: Manually unparent placeholder in dispose
    
    We can't make the placeholder a non-internal child as that breaks
    applications that previously relied on foreach() to only return
    GtkListBoxRow instances. Instead, unparent the placeholder manually in
    dispose.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782494

 gtk/gtklistbox.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtklistbox.c b/gtk/gtklistbox.c
index f16e02a..702e342 100644
--- a/gtk/gtklistbox.c
+++ b/gtk/gtklistbox.c
@@ -409,6 +409,20 @@ gtk_list_box_finalize (GObject *obj)
 }
 
 static void
+gtk_list_box_dispose (GObject *object)
+{
+  GtkListBoxPrivate *priv = BOX_PRIV (object);
+
+  if (priv->placeholder)
+    {
+      gtk_widget_unparent (priv->placeholder);
+      priv->placeholder = NULL;
+    }
+
+  G_OBJECT_CLASS (gtk_list_box_parent_class)->dispose (object);
+}
+
+static void
 gtk_list_box_class_init (GtkListBoxClass *klass)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
@@ -421,6 +435,7 @@ gtk_list_box_class_init (GtkListBoxClass *klass)
   object_class->get_property = gtk_list_box_get_property;
   object_class->set_property = gtk_list_box_set_property;
   object_class->finalize = gtk_list_box_finalize;
+  object_class->dispose = gtk_list_box_dispose;
   widget_class->enter_notify_event = gtk_list_box_enter_notify_event;
   widget_class->leave_notify_event = gtk_list_box_leave_notify_event;
   widget_class->motion_notify_event = gtk_list_box_motion_notify_event;