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Maybe because you've invoked the Discard with the focus in the Repositories view and not in the Files view? If the focus is in the Repositories view the Files view selection does not matter for any command.
Accidently Discard is prevented by a confirmation dialog.
It is not planned for 18.1, but maybe 18.2.
I thought to have it added where users would search for it.

Currently, views are displayed in tabs. And currently, you can open multiple repositories in the same repository window.
Yes, this could be an option, but IMHO a bad one - tabs inside tabs are considered bad UI design.
BTW, how to handle the case where multiple repositories would be opened?
Do you know any other Git GUI client which already supports bisecting? Until now I only have done manual bisecting with a "good" and "bad" branch.
Customer support service by UserEcho
Sorry, Thomas, but it looks like you didn't even try to use this "system
specific hover-event" in Windows 7, because it works horrible and for
sure not as intended.
Of course, I did and it works fine on 99% of the machines. Maybe you have configured yours somehow non-standard?But to make you happy I've added the VM option smartgit.toolbar.popupEnabled for 18.1 preview #12049. Set it to false and you won't see any optional popups.