Noweb references and padlines

[Linus Arver]

Hello,

Org supports adding blank lines between concatenated source code blocks
with the "padline" header argument [1]. However this does not work for
Noweb references.

For example, a blank line is inserted between "foo" and "bar" and again
between "bar" and "baz" for tangling-padline.txt below:

    #+begin_src txt :tangle tangling-padline.txt
    foo
    #+end_src

    #+begin_src txt :tangle tangling-padline.txt
    bar
    #+end_src

    #+begin_src txt :tangle tangling-padline.txt
    baz
    #+end_src

So tangling-padline.txt looks like

--8<---------------cut here---------------start------------->8---
foo

bar

baz
--8<---------------cut here---------------end--------------->8---

Which is great. But the same blank lines are not inserted for the
following case using "Noweb chunk" as a Noweb reference:

    #+begin_src txt :tangle tangling-padline-noweb.txt
    <<Noweb chunk>>
    #+end_src

    #+header: :noweb-ref Noweb chunk
    #+begin_src txt
    foo
    #+end_src

    #+header: :noweb-ref Noweb chunk
    #+begin_src txt
    bar
    #+end_src

    #+header: :noweb-ref Noweb chunk
    #+begin_src txt
    baz
    #+end_src

And now tangling-padline-noweb.txt looks like

--8<---------------cut here---------------start------------->8---
foo
bar
baz
--8<---------------cut here---------------end--------------->8---

Is this discrepancy intentional? If not, I guess you could consider this
email as a bug report. I'm not sure how to implement a workaround using
Org tangle hooks [1]; if it is possible to have a workaround please do
let me know!

Software versions:

  - GNU Emacs 29.4 (build 1, aarch64-apple-darwin23.5.0, NS
appkit-2487.60 Version 14.5 (Build 23F79))
  - Org mode version 9.7.11 (9.7.11-??-6a5d0ed34 @
/Users/l/syscfg/emacs/doom-upstream/.local/straight/build-29.4/org/)

I am not subscribed to this list so please CC me on replies, thanks.

[1] https://orgmode.org/manual/Extracting-Source-Code.html