pathbar: show webdav directories

Currently pathbar is not updated for webdav directories and shows
previous non-webdav location pathbar. The problem seems to be fact
that last(?) parent is not local file in which case
g_file_query_info_async returns "The specified location is not
mounted" error.

gtk/gtkpathbar.c

@@ -1497,6 +1497,20 @@ gtk_path_bar_set_file_finish (struct SetFileInfo *info,
   g_free (info);
 }
 
+static gboolean
+is_local (GFile *file)
+{
+  gchar *path;
+
+  path = g_file_get_path (file);
+  if (path == NULL)
+    return FALSE;
+
+  g_free (path);
+
+  return TRUE;
+}
+
 static void
 gtk_path_bar_get_info_callback (GCancellable *cancellable,
 			        GFileInfo    *info,
@@ -1558,6 +1572,8 @@ gtk_path_bar_get_info_callback (GCancellable *cancellable,
     }
 
   file_info->parent_file = g_file_get_parent (file_info->file);
+  if (!is_local (file_info->parent_file))
+    g_clear_object (&file_info->parent_file);
 
   /* Recurse asynchronously */
   priv->get_info_cancellable = _gtk_file_system_get_info (priv->file_system,