I was looking at bug 1279563 this morning, which was spawned off bug 1277406, so I wanted to take a look at the original diff I had reviewed there. So I went off from bug 1277406 comment 207, and clicked on the reviewboard link there, which got me to the comment view. From there, I was lost and couldn't find a way to get the diff because the corresponding changeset was discarded. mcote pointed me to the diff "tab", which does what I was looking for, but discoverability is not very awesome. One possibility he mentioned was to have the discarded changeset displayed striked out in the changeset table.
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