Alex Branham <alex.branham@gmail.com> writes:

> I'm sorry, haven't had my morning coffee yet. I can reproduce this, but there
> was an error in my initial email. From emacs -Q
>
> (setq shell-command-dont-erase-buffer 'beg-last-out
>       async-shell-command-display-buffer nil)
>
> then do an async shell command, delete the window that shows the output, then
> call another async shell command. The window is never re-shown.

Thanks, I'm able to reproduce this on both emacs-26 and master branches
and believe the attached patch fixes the issue.

-- 
Basil