Discarding a whole file isn't working.

In my case, the files I'm trying to discard only have whitespace changes. With the option "ignore whitespace" ticked, it shows no code changes. But, it doesn't matter which whitespace option is ticked, discarding the file won't work.It just simply doesn't work. No errors or anything.

It appears to try to do something, as the screen refreshes for a split second, but effectively nothing happens.