Interrupt spells should not flash if they're on cooldown.

I think the right answer is probably "should not flash unless the interrupt spell will come off cooldown before the spell to be interrupted finishes casting".

I definitely want to know if there's something I can interrupt, because sometimes I want to be spamming the interrupt button as it comes off cooldown because I can just sneak an interrupt in. I did think about this and how it works now is a deliberate decision rather than an accident/bug.

I will consider the possibility of the cooldown vs cast time check. There are some awkward mob spells that have a cast immediately followed by a channel that might make this look weird.

In a solo scenario or in a pure emergency I agree; but in a team play situation (raid/m+) if you can't kick it's simply someone else's turn. You don't really need, or want, to know if your kick will just about come off CD. For me, it's better to have the clarity that's it's just not your turn. I mostly play tanks, which is probably why I have this opinion.

I think Adibuttonauras has a 'no flash on cooldown' tick box on it's main options page.

114225c / 9.1.5 now only shows flash if interrupt will be available before cast end.

I'm going to leave this open for a bit in case I change my mind after using it for a while. I appreciate your position, but I think this is the right behaviour even if it's not what you are used to.

That's cool. I will try it out!

It is not easy to be cautiously hubristic, when I know how much of a fool I will look when I'm wrong and change my mind. :)

Closing this off years later, still happy with how it works.