Hmm, if I click on a unit ability twice or click on the icon, I still don't see the cancel text hint. Good cases are when clicking outside the active ability's range or when using the mouse wheel scroll to toggle in between.

You basically fixed the initial issue, though I commented on the issue a while after wanting to make it more generic, I could merge this PR and make another issue, let me know how far you want to go with this one. Switching between one ability to another one shouldn't really show a cancel text hint, too cluttered like that.

That's strange. Unless I'm misunderstanding, my local build is behaving as you describe you want it to. For example, if I spawn a Scavenger, move it in front of an enemy, and then click its Slicing Pounce ability twice, I receive the Canceled text hint. If I scroll through the abilities with my mousewheel I don't receive the hint unless it scrolls to a passive ability.

You're right, it's perfect, well done! I was testing the wrong thing and had some caching issues as well apparently, I'm a bit under the weather today, so I'm not getting things done right that easily overall xD