virt-manager thinks an ISO file is a directory

[Patrick O'Callaghan]

Trying to set up a new VM using virt-manager (KVM/QEMU) , something
I've done several times before now. However on specifying an ISO file
for installation it's telling me "<filename> must be a file or device,
not a directory". This is nonsense as the ISO is unquestionably a file.

Is this a new bug?

poc