[gimp] Check if there is an active layer if active_layer_only is TRUE

[Michael Natterer <mitch src gnome org>]

commit 0953146be10a2d6c23ac53de90fd95e3e000c4e0
Author: Michael Natterer <mitch gimp org>
Date:   Thu Aug 20 22:41:49 2009 +0200

    Check if there is an active layer if active_layer_only is TRUE

 app/core/gimpimage-crop.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/app/core/gimpimage-crop.c b/app/core/gimpimage-crop.c
index 9cdaa5e..40ebcde 100644
--- a/app/core/gimpimage-crop.c
+++ b/app/core/gimpimage-crop.c
@@ -89,6 +89,8 @@ gimp_image_crop (GimpImage   *image,
 
   g_return_if_fail (GIMP_IS_IMAGE (image));
   g_return_if_fail (GIMP_IS_CONTEXT (context));
+  g_return_if_fail (active_layer_only == FALSE ||
+                    gimp_image_get_active_layer (image));
 
   previous_width  = gimp_image_get_width (image);
   previous_height = gimp_image_get_height (image);