[PATCH 1/7] emacs/tree: return true if a thread was found in next-thread

[William Casarin]

William Casarin <jb55 at jb55.com> writes:

> This will allow us to pop back to parent buffers when there are no
> more threads to jump to.
>
> Signed-off-by: William Casarin <jb55 at jb55.com>
> ---
>
>  This is as rebased version of id:20191228150124.20630-1-jb55 at jb55.com
>  as requested in id:87v9mg3gut.fsf at tethera.net 

sorry I included some duplicate patches in here, but they should be identical.