Patch attached.

Thanks!
-- 
Nick
>From b7ae1e8027b7b935098bb4354a957722b55afb1d Mon Sep 17 00:00:00 2001
From: Nick Dokos <ndo...@gmail.com>
Date: Tue, 15 Oct 2024 21:28:32 -0400
Subject: [PATCH] `org-babel-header-arg-expand': more stringent check for
 appropriate context

The check for appropriate context in `org-babel-header-arg-expand' was
inadequate: a colon was deemed appropriate anywhere in the source
block, not just in the header.

* lisp/ob-core.el (org-babel-header-arg-expand): the function now uses
`org-babel-in-src-block-header-p' to check for appropriate context.
(org-babel-in-src-block-header-p): New function.

Reported-by: use @Addlai on Emacs SE.
Link: https://list.orgmode.org/orgmode/87zfnrb2nu....@pierrot.dokosmarshall.org/
---
 lisp/ob-core.el | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index e6db422c9d20..60705036cc7e 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -1093,10 +1093,19 @@ completion from lists of common args and values."
       (unless (= (char-before (point)) ?\ ) (insert " "))
       (insert ":" header-arg) (when value (insert " " value)))))
 
+(defun org-babel-in-src-block-header-p ()
+  "Check whether `point' is in the header line of the source block."
+  (let ((beg (org-babel-where-is-src-block-head)))
+    (when beg
+      (let ((end (save-excursion (goto-char beg) (end-of-line) (point))))
+        (and (>= (point) beg) (<= (point) end))))))
+
 ;; Add support for completing-read insertion of header arguments after ":"
 (defun org-babel-header-arg-expand ()
-  "Call `org-babel-enter-header-arg-w-completion' in appropriate contexts."
-  (when (and (equal (char-before) ?\:) (org-babel-where-is-src-block-head))
+  "Call `org-babel-enter-header-arg-w-completion' in appropriate contexts
+(the header line of a source block)."
+  (when (and (equal (char-before) ?\:)
+             (org-babel-in-src-block-header-p))
     (org-babel-enter-header-arg-w-completion (match-string 2))))
 
 (defun org-babel-enter-header-arg-w-completion (&optional lang)
-- 
2.46.0

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