Accounting batch filters ignore criteria based on custom fields

Tested on 4.7 demo site:

1. Configure custom fields so that there is at least one searchable custom field attached to Contributions
2. Go to Contributions > Accounting Batches > New Batch, and click Save
3. This takes you to a page with URL like http://mysite/civicrm/batchtransaction?reset=1&bid=N
4. Adjust search criteria to get a reasonably small number of results;
5. Edit one or more of the found contributions so that you know they have different values in the searchable custom field (do this in a separate tab if you wish)
6. Back on http://mysite/civicrm/batchtransaction?reset=1&bid=N, adjust the search criteria to filter by differences in the searchable custom field.
7. Observe that search results do not change regardless of criteria for the searchable custom field.