Filtering fails to clear cached selections

Cached selections are held onto for items not in the current view, making it easy to accidentally perform operations on the wrong objects. To reproduce:

1. Create a Node view with Nid and Title, using Bulk Operations (including the Delete Node operation).
2. Add an exposed filter on the title.
3. In the view, select a node and click the Delete Node button. On the confirmation page you see that node title listed. Click the Cancel link.
4. The node is still selected (as it should be). Filter the view by title so the original node is no longer included in the view.
5. Select one of the nodes now displayed and click the Delete Node button. Both this node and the original node are now displayed (and will be deleted if you continue).

If you're not alert, or you've disabled confirmation for your actions...

I plan on working on this and supplying a patch next week (but if someone else gets to it first, that would be great...)

Thanks.