I need this button because my directory with .iso files changes frequently. Now I should issue pool-refresh command in virsh...
Implemented in at least virt-manager 0.8.5 - see Fedora bug #530448 and upstream commit http://hg.fedorahosted.org/hg/virt-manager/rev/679b824e92dc This should probably be closed?
*** This bug has been marked as a duplicate of bug 530448 ***