Try harder to find the host path for the documents

When the access to the directory is provided by the portal (like
browser download directory) the stored files in the directory
are not found by xdp_get_real_path_for_doc_path and /run/user/...
path is opened instead of host path by the OpenFile or OpenDirectory portal.

src/open-uri.c

@@ -585,6 +585,38 @@ app_exists (const char *app_id)
   return (info != NULL);
 }
 
+static char *
+get_host_path_for_document_path (const char* document_path,
+                                 XdpAppInfo* app_info)
+{
+  char *host_path = xdp_get_real_path_for_doc_path (document_path,
+                                                    app_info);
+  GList *path_parts = NULL;
+  /* Try harder when still getting /run/user path, the document portal
+     could provide directory instead of file or subdirectory. */
+  while (g_str_has_prefix (host_path, "/run/user"))
+    {
+      g_autofree char *dirname = g_path_get_dirname (host_path);
+      path_parts = g_list_prepend (path_parts,
+                                   g_path_get_basename (host_path));
+      g_free (host_path);
+      host_path = xdp_get_real_path_for_doc_path (dirname, app_info);
+    }
+
+  if (path_parts)
+    {
+      g_autoptr (GPathBuf) path_buf = g_path_buf_new_from_path (host_path);
+      for (GList *p = path_parts; p != NULL; p = p->next)
+        {
+          g_path_buf_push (path_buf, p->data);
+        }
+      g_free (host_path);
+      host_path = g_path_buf_to_path (path_buf);
+      g_list_free_full (path_parts, g_free);
+    }
+  return host_path;
+}
+
 static void
 handle_open_in_thread_func (GTask *task,
                             gpointer source_object,
@@ -688,7 +720,7 @@ handle_open_in_thread_func (GTask *task,
 
       if (path != NULL)
         {
-          host_path = xdp_get_real_path_for_doc_path (path, request->app_info);
+          host_path = get_host_path_for_document_path (path, request->app_info);
           if (host_path)
             {
               g_debug ("OpenFile: translating path value '%s' to host path '%s'", path, host_path);
@@ -724,7 +756,8 @@ handle_open_in_thread_func (GTask *task,
 
       if (open_dir)
         {
-          g_autofree char *real_path = xdp_get_real_path_for_doc_path (path, request->app_info);
+          g_autofree char *real_path = get_host_path_for_document_path (path,
+                                                                        request->app_info);
           /* Try opening the directory via the file manager interface, then
              fall back to a plain URI open */
           g_autoptr(GError) local_error = NULL;