[gtk+/gtk-3-22] icon-theme: Show filename attempted when icon fails to load

[Robert Ancell <rancell src gnome org>]

commit 112a61a78281243cb4d63f01c9527aee80711d47
Author: Robert Ancell <robert ancell canonical com>
Date:   Thu Jun 8 12:08:22 2017 +1200

    icon-theme: Show filename attempted when icon fails to load

 gtk/gtkicontheme.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index 5a416b7..c865fc6 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -2343,6 +2343,7 @@ gtk_icon_theme_load_icon_for_scale (GtkIconTheme        *icon_theme,
     }
 
   pixbuf = gtk_icon_info_load_icon (icon_info, error);
+  g_prefix_error (error, "Failed to load %s: ", icon_info->filename);
   g_object_unref (icon_info);
 
   return pixbuf;