[gimp/soc-2011-seamless-clone2] app: don't crash when adjusting quality during an export to jpeg

[Clayton Walker <claytonw src gnome org>]

commit bee1b1587f056419a4cfd7f24be8490a4842bef0
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Sat May 4 18:13:19 2013 +0200

    app: don't crash when adjusting quality during an export to jpeg
    
    with preview enabled

 app/display/gimpcanvaslayerboundary.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/app/display/gimpcanvaslayerboundary.c b/app/display/gimpcanvaslayerboundary.c
index f34284e..d64d6e3 100644
--- a/app/display/gimpcanvaslayerboundary.c
+++ b/app/display/gimpcanvaslayerboundary.c
@@ -69,6 +69,7 @@ static void             gimp_canvas_layer_boundary_get_property (GObject
                                                                  guint           property_id,
                                                                  GValue         *value,
                                                                  GParamSpec     *pspec);
+static void             gimp_canvas_layer_boundary_finalize     (GObject        *object);
 static void             gimp_canvas_layer_boundary_draw         (GimpCanvasItem *item,
                                                                  cairo_t        *cr);
 static cairo_region_t * gimp_canvas_layer_boundary_get_extents  (GimpCanvasItem *item);
@@ -90,6 +91,7 @@ gimp_canvas_layer_boundary_class_init (GimpCanvasLayerBoundaryClass *klass)
 
   object_class->set_property = gimp_canvas_layer_boundary_set_property;
   object_class->get_property = gimp_canvas_layer_boundary_get_property;
+  object_class->finalize     = gimp_canvas_layer_boundary_finalize;
 
   item_class->draw           = gimp_canvas_layer_boundary_draw;
   item_class->get_extents    = gimp_canvas_layer_boundary_get_extents;
@@ -114,6 +116,17 @@ gimp_canvas_layer_boundary_init (GimpCanvasLayerBoundary *layer_boundary)
 }
 
 static void
+gimp_canvas_layer_boundary_finalize (GObject *object)
+{
+  GimpCanvasLayerBoundaryPrivate *private = GET_PRIVATE (object);
+
+  if (private->layer)
+    g_object_remove_weak_pointer (G_OBJECT (private->layer), (gpointer)&private->layer);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
 gimp_canvas_layer_boundary_set_property (GObject      *object,
                                          guint         property_id,
                                          const GValue *value,
@@ -124,7 +137,11 @@ gimp_canvas_layer_boundary_set_property (GObject      *object,
   switch (property_id)
     {
     case PROP_LAYER:
+      if (private->layer)
+        g_object_remove_weak_pointer (G_OBJECT (private->layer), (gpointer)&private->layer);
       private->layer = g_value_get_object (value); /* don't ref */
+      if (private->layer)
+        g_object_add_weak_pointer (G_OBJECT (private->layer), (gpointer)&private->layer);
       break;
     case PROP_EDIT_MASK:
       private->edit_mask = g_value_get_boolean (value);