[gimp/gimp-2-10] app: hide container-editor busy box when clearing async-set binding

[Ell <ell src gnome org>]

commit 129a2c6179d8ed988f23e74b08e189faca61ec4e
Author: Ell <ell_se yahoo com>
Date:   Thu May 31 04:49:31 2018 -0400

    app: hide container-editor busy box when clearing async-set binding
    
    (cherry picked from commit e5e998e9c5ae12d62a1b67d2d27e71b530cc04fa)

 app/widgets/gimpcontainereditor.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/app/widgets/gimpcontainereditor.c b/app/widgets/gimpcontainereditor.c
index 403d90dcc7..f0a59f753b 100644
--- a/app/widgets/gimpcontainereditor.c
+++ b/app/widgets/gimpcontainereditor.c
@@ -560,6 +560,9 @@ gimp_container_editor_bind_to_async_set (GimpContainerEditor *editor,
   g_return_if_fail (async_set == NULL || GIMP_IS_ASYNC_SET (async_set));
   g_return_if_fail (async_set == NULL || message != NULL);
 
+  if (! async_set && ! editor->priv->async_set_binding)
+    return;
+
   g_clear_object (&editor->priv->async_set_binding);
 
   if (async_set)
@@ -572,4 +575,8 @@ gimp_container_editor_bind_to_async_set (GimpContainerEditor *editor,
         editor->priv->busy_box, "visible",
         G_BINDING_SYNC_CREATE | G_BINDING_INVERT_BOOLEAN);
     }
+  else
+    {
+      gtk_widget_hide (editor->priv->busy_box);
+    }
 }