[gvfs] backend: Fix querying of thumbnail::failed attribute

[Ondrej Holy <oholy src gnome org>]

commit ebc61e107398704b69fb326b9fcece81a3be9e70
Author: Ondrej Holy <oholy redhat com>
Date:   Thu Dec 7 13:42:45 2017 +0100

    backend: Fix querying of thumbnail::failed attribute
    
    The thumbnail::failed would previously only be set if thumbnail::path
    was included in the query, so querying for just thumbnail::failed
    would return no results. This fixes the behaviour of "gio info -a
    thumbnail::failed URI".
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791325

 daemon/gvfsbackend.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/daemon/gvfsbackend.c b/daemon/gvfsbackend.c
index 0ba1988..b909603 100644
--- a/daemon/gvfsbackend.c
+++ b/daemon/gvfsbackend.c
@@ -583,8 +583,10 @@ g_vfs_backend_add_auto_info (GVfsBackend *backend,
     }
 
   if (uri != NULL &&
-      g_file_attribute_matcher_matches (matcher,
-                                       G_FILE_ATTRIBUTE_THUMBNAIL_PATH))
+      (g_file_attribute_matcher_matches (matcher,
+                                         G_FILE_ATTRIBUTE_THUMBNAIL_PATH) ||
+       g_file_attribute_matcher_matches (matcher,
+                                         G_FILE_ATTRIBUTE_THUMBNAILING_FAILED)))
     get_thumbnail_attributes (uri, info);
   
 }