[gimp/gimp-2-8] app: don't crash when adjusting quality during an export to jpeg

[Massimo Valentini <mvalentini src gnome org>]

commit 9937a0a99b2b721859b6c1d35fdad1d0230d965b
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Sat May 4 18:19:11 2013 +0200

    app: don't crash when adjusting quality during an export to jpeg
    
    with preview enabled
    (cherry picked from commit 8940b25c6dd6e9a280f93db4bad95e7447975b2c)

 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 54a7e35..587e2cd 100644
--- a/app/display/gimpcanvaslayerboundary.c
+++ b/app/display/gimpcanvaslayerboundary.c
@@ -72,6 +72,7 @@ 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,
                                                                  GimpDisplayShell *shell,
                                                                  cairo_t          *cr);
@@ -96,6 +97,7 @@ 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;
@@ -120,6 +122,17 @@ 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,
@@ -130,7 +143,11 @@ 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);