[Orgmode] [BUG] Org-capture breaks if captured-to file is open in a narrowed buffer

[Jules Bean]

If I run org-capture with the template:

("t" "Todo" entry (file+headline
"/Users/jules/work/TODO.org" "Tasks") "* TODO %?
  (Captured at %u)
  %i
  %a
")

whilst I have narrowed (using, e.g., org-narrow-to-subtree) the buffer
that contains TODO.org, a new "* Tasks" headline is inserted at the
end of my narrowing and the new entry is added there, which messes up
the hierarchy of the file.

Thanks,

Jules