[gthumb] Fixed a memory leak in GthCellRendererThumbnail

[Paolo Bacchilega <paobac src gnome org>]

commit 6169d4d4a916bff0328755343c93986b38a08075
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Thu Nov 3 17:41:34 2011 +0100

    Fixed a memory leak in GthCellRendererThumbnail

 gthumb/gth-cell-renderer-thumbnail.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/gthumb/gth-cell-renderer-thumbnail.c b/gthumb/gth-cell-renderer-thumbnail.c
index 7a4b1ba..360f5d4 100644
--- a/gthumb/gth-cell-renderer-thumbnail.c
+++ b/gthumb/gth-cell-renderer-thumbnail.c
@@ -132,6 +132,8 @@ gth_cell_renderer_thumbnail_set_property (GObject      *object,
 		self->priv->is_icon = g_value_get_boolean (value);
 		break;
 	case PROP_THUMBNAIL:
+		if (self->priv->thumbnail != NULL)
+			g_object_unref (self->priv->thumbnail);
 		self->priv->thumbnail = g_value_dup_object (value);
 		break;
 	case PROP_FILE:
@@ -248,10 +250,6 @@ gth_cell_renderer_thumbnail_render (GtkCellRenderer      *cell,
 					      &thumb_rect.width,
 					      &thumb_rect.height);
 
-	pixbuf = self->priv->thumbnail;
-	if (pixbuf == NULL)
-		return;
-
 	gtk_cell_renderer_get_padding (cell, &xpad, &ypad);
 
 	thumb_rect.x += cell_area->x + xpad;
@@ -262,6 +260,12 @@ gth_cell_renderer_thumbnail_render (GtkCellRenderer      *cell,
 	if (! gdk_rectangle_intersect (cell_area, &thumb_rect, &draw_rect))
 		return;
 
+	pixbuf = self->priv->thumbnail;
+	if (pixbuf == NULL)
+		return;
+
+	g_object_ref (pixbuf);
+
 	image_rect.width = gdk_pixbuf_get_width (pixbuf);
 	image_rect.height = gdk_pixbuf_get_height (pixbuf);
 	image_rect.x = thumb_rect.x + (thumb_rect.width - image_rect.width) * .5;
@@ -400,6 +404,7 @@ gth_cell_renderer_thumbnail_render (GtkCellRenderer      *cell,
 	}
 
 	gtk_style_context_restore (style_context);
+	g_object_unref (pixbuf);
 }