[PATCH] emacs: Refuse requests to refresh tree views while a refresh is running

[David Bremner]

Vladimir Panteleev <git at thecybershadow.net> writes:

> notmuch-tree did not protect against concurrent refreshes like
> notmuch-search, meaning, hitting '=' (notmuch-refresh-this-buffer)
> quickly will spawn multiple parallel notmuch processes, and clobber
> the existing results in the current buffer.
>

pushed

d