bug#21489: 25.0.50; Echoing and message interaction (Bug#21489)

[Paul Eggert]

Jay Belanger wrote:
> I think it had to do with getting help for prefixes from within Calc.
> I don't recall the details, though, and I may have found a workaround
> for the problem I was having.
> At any rate, unless someone else wants to keep it open, the bug might as
> well be closed.

Thanks, for now I'll close the bug since it's marked as a blocker for Emacs 25. 
We can reopen it later (or open a new one) if the problem turns up later for 
you, or for someone else.