Filter Subscription, Manage Subscriptions and Delete Filter actions display incorrect summary for saved search request

Steps to reproduce:

1. Create a saved filter
2. Modify the filter but do not re-save it
3. Go to "Manage Filters"
4. Choose "Subscribe" or "Delete" on the saved filter that you previously created

The summary pane on the left hand side shows the summary of the search request which is still unsaved in the session, and not the one which was chosen in the list of filters.