generating multiple images with the same parameters in the same second confuses the web UI

[ssube]

The web UI tracks in-progress jobs based on their ID, which is in turn based on the parameters and timestamp. If two different clients request the same image in the same second, the jobs will be de-duplicated, which is probably ok. However, the web UI adds two or more in-progress image cards, but only one of them ever resolves. Refreshing the web UI usually makes the extra cards disappear.