org-open-at-point and narrow subtree

[Marc Coquand]

Hi,

I'm trying to setup so that when I follow a link using org, it also
automatically runs org-narrow-to-subtree.

There is a org-follow-link-hook that I think could be used. However,
there is a limitation that not all links lead to org files, so there
needs to be some check that the actual destination is an org-file.

I was also wondering if there can be a conflict if the buffer is already
open and narrowed, and that that could cause issues. 

Sincerely,
-- Marc