Bug: octave newline not printed when using :session [9.8-pre (release_9.7.18-205-g0ce4f3)]

Bug: octave newline not printed when using :session [9.8-pre (release_9.7.18-205-g0ce4f3)]

[Paul Stansell]

[-- Attachment #1.1: Type: text/plain, Size: 4436 bytes --]

Hello,

The attached org file gives an example of output from an octave code block
that is unexpected and inconsistent.  The problem is that disp("\n") does
not print a new line.  The problem only occurs when the ":session" header
is used.

Paul




Emacs  : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.33, cairo version 1.16.0)
 of 2024-09-17, modified by Debian
Package: Org mode version 9.8-pre (release_9.7.18-205-g0ce4f3.dirty @
~/.emacs.d_org_from_git/org-mode-git/lisp/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
    org-src-mode-configure-edit-buffer)
 org-link-shell-confirm-function 'yes-or-no-p
 org-sort-function 'string-collate-lessp
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-persist-directory "/tmp/org-persist-J74MUs"
 org-persist-before-write-hook '(org-element--cache-persist-before-write)
 org-mode-hook '(#[0 "\300\301\302\303\304$\207"
  [add-hook change-major-mode-hook org-fold-show-all append
   local]
  5]
#[0 "\300\301\302\303\304$\207"
  [add-hook change-major-mode-hook org-babel-show-result-all
   append local]
  5]
org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-persist-before-read-hook '(org-element--cache-persist-before-read)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-persist-after-read-hook '(org-element--cache-persist-after-read)
 org-bibtex-headline-format-function 'org-bibtex-headline-format-default
 org-babel-pre-tangle-hook '(save-buffer)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
     org-babel-header-arg-expand)
 org-babel-load-languages '((octave . t))
 org-cycle-tab-first-hook '(org-babel-hide-result-toggle-maybe
   org-babel-header-arg-expand)
 org-agenda-loop-over-headlines-in-active-region nil
 org-fold-core-isearch-open-function 'org-fold--isearch-reveal
 org-occur-hook '(org-first-headline-recenter)
 org--warnings nil
 org-cycle-hook '(org-cycle-hide-archived-subtrees
org-cycle-show-empty-lines
 org-cycle-optimize-window-after-visibility-change
 org-cycle-display-link-previews)
 org-speed-command-hook '(org-speed-command-activate
 org-babel-speed-command-activate)
 org-yank-image-file-name-function 'org-yank-image-autogen-filename
 org-export-before-parsing-hook '(org-attach-expand-links)
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("attachment" :follow org-attach-follow :complete
org-attach-complete-link :preview
org-attach-preview-file)
      ("id" :follow org-id-open :store
org-id-store-link-maybe)
      ("eww" :follow org-eww-open :store org-eww-store-link)
      ("rmail" :follow org-rmail-open :store
org-rmail-store-link)
      ("mhe" :follow org-mhe-open :store org-mhe-store-link)
      ("irc" :follow org-irc-visit :store org-irc-store-link
:export org-irc-export)
      ("info" :follow org-info-open :export org-info-export
:store org-info-store-link :insert-description
org-info-description-as-command)
      ("gnus" :follow org-gnus-open :store
org-gnus-store-link)
      ("docview" :follow org-docview-open :export
org-docview-export :store org-docview-store-link)
      ("bibtex" :follow org-bibtex-open :store
org-bibtex-store-link)
      ("bbdb" :follow org-bbdb-open :export org-bbdb-export
:complete org-bbdb-complete-link :store
org-bbdb-store-link)
      ("w3m" :store org-w3m-store-link)
      ("doi" :follow org-link-doi-open :export
org-link-doi-export)
      ("file+sys") ("file+emacs")
      ("shell" :follow org-link--open-shell)
      ("news" :follow
#[514 "\301\300\302 Q \"\207"
 ["news" browse-url ":"] 6 "\n\n(fn URL ARG)"]
)
      ("mailto" :follow
#[514 "\301\300\302 Q \"\207"
 ["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"]
)
      ("https" :follow
#[514 "\301\300\302 Q \"\207"
 ["https" browse-url ":"] 6 "\n\n(fn URL ARG)"]
)
      ("http" :follow
#[514 "\301\300\302 Q \"\207"
 ["http" browse-url ":"] 6 "\n\n(fn URL ARG)"]
)
      ("ftp" :follow
#[514 "\301\300\302 Q \"\207" ["ftp" browse-url ":"]
 6 "\n\n(fn URL ARG)"]
)
      ("help" :follow org-link--open-help :store
org-link--store-help)
      ("file" :complete org-link-complete-file :preview
org-link-preview-file)
      ("elisp" :follow org-link--open-elisp))
 org-link-elisp-confirm-function 'yes-or-no-p
 org-confirm-babel-evaluate nil
 )
-- 
Paul

[-- Attachment #1.2: Type: text/html, Size: 5827 bytes --]

[-- Attachment #2: bug.org --]
[-- Type: application/octet-stream, Size: 439 bytes --]

This code block gives the expected output, where there are two newlines
printed.
#+begin_src octave :results output
  disp("\n ---")
  disp("\n ---")
#+end_src

#+RESULTS:
: 
:  ---
: 
:  ---

Running the same code, but this time with ~:session oct1~, gives
the unexpected output as there is only one newlines printed.
#+begin_src octave :session oct1 :results output
  disp("\n ---")
  disp("\n ---")
#+end_src

#+RESULTS:
: ---
: ---