[glade/css] Added error message if it can not save the slideshow

[Juan Pablo Ugarte <jpu src gnome org>]

commit e21c65ce164cab48bff9478c16ad40f22d01c3fd
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Mon Jul 29 21:36:33 2013 -0300

    Added error message if it can not save the slideshow

 gladeui/glade-preview-window.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/gladeui/glade-preview-window.c b/gladeui/glade-preview-window.c
index ca9653f..c2fe719 100644
--- a/gladeui/glade-preview-window.c
+++ b/gladeui/glade-preview-window.c
@@ -480,8 +480,13 @@ glade_preview_window_screenshot (GladePreviewWindow *window,
     {
       GdkPixbuf *pix = gdk_pixbuf_get_from_window (gdkwindow, 0, 0, w, h);
       const gchar *ext = glade_preview_get_extension (filename);
+      GError *error = NULL;
       
-      gdk_pixbuf_save (pix, filename, ext ? ext : "png", NULL, NULL);
+      if (gdk_pixbuf_save (pix, filename, ext ? ext : "png", &error, NULL))
+        {
+          g_warning ("Could not save screenshot to %s because %s", filename, error->message);
+          g_error_free (error);
+        }
 
       g_object_unref (pix);
     }
@@ -544,4 +549,6 @@ glade_preview_window_slideshow_save (GladePreviewWindow *window,
       cairo_destroy (cr);
       cairo_surface_destroy(surface);
     }
+  else
+    g_warning ("Could not save slideshow to %s", filename);
 }