What about Xcode? According to the PR where they tried to solve it (https://github.com/transmission/transmission/pull/1), it seems it suffers from the same problem.
I didn’t expect “I can’t click “Open Downloaded File” on a file downloading application because the scroll bar is in the way” would generate any discussion. It should be obvious to everyone that it’s an issue and should be fixed.
Yes, everyone seems to agree it should be fixed, not sure why you felt the need to write this?
There was a PR (https://github.com/transmission/transmission/pull/1) and there is a issue (https://github.com/transmission/transmission/issues/261) where they have been trying to come up with a solution, but seems they've been unable to.
If you know how to fix it (even if just by written word), please do help them to fix it by sharing the solution, as you don't seem to be the only one who is disturbed by the issue.