org-babel-view-src-block-info: Fix querying Org properties in Help buffer

* lisp/ob-core.el (org-babel-view-src-block-info): Query in-buffer
header arguments (`org-entry-get') from Org buffer.  It does nothing
from *Help* buffer.

In the previous version, when the user interactively calls
`org-babel-view-src-block-info' and the point is on a code block, these
two warnings are shown in the buffer *Warnings*:

⛔ Warning (org-element): ‘org-element-at-point’ cannot be used in non-Org buffer #<buffer *Help*> (help-mode)
⛔ Warning (org-element): ‘org-element-at-point’ cannot be used in non-Org buffer #<buffer *Help*> (help-mode)

This happened because `org-babel-view-src-block-info'
calls (org-entry-get (point) "header-args" t) while being in
the *Help* buffer.  `org-babel-view-src-block-info' should call
org-entry-get while being in the Org Mode buffer and then switch to
the *Help* buffer once it has all the information that is then
displayed in the *Help* buffer.

In the introduced changes, we execute (org-entry-get (point)
"header-args" t) while being in the Org Mode buffer and we switch
to *Help* when we have the necessary information that is then shown in
the *Help* buffer.

TINYCHANGE

1 files changed, 18 insertions, 9 deletions

diff --git a/lisp/ob-core.el b/lisp/ob-core.el
index 7b4ca9b5e..263d1d94a 100644
--- a/lisp/ob-core.el
+++ b/lisp/ob-core.el
@@ -358,18 +358,27 @@ a window into the `org-babel-get-src-block-info' function."
 	(full (lambda (it) (> (length it) 0)))
 	(printf (lambda (fmt &rest args) (princ (apply #'format fmt args)))))
     (when info
-      (with-help-window (help-buffer)
-	(let ((name        (nth 4 info))
-	      (lang        (nth 0 info))
-	      (switches    (nth 3 info))
-	      (header-args (nth 2 info)))
+      (let* ((name        (nth 4 info))
+	     (language    (nth 0 info))
+	     (switches    (nth 3 info))
+	     (header-args (nth 2 info))
+	     (property-header-args
+              (org-entry-get (point) "header-args" t))
+             (property-header-args-language
+              (org-entry-get (point) (concat "header-args:" language) t)))
+	(with-help-window (help-buffer)
 	  (when name            (funcall printf "Name: %s\n"     name))
-	  (when lang            (funcall printf "Lang: %s\n"     lang))
+	  (when language        (funcall printf "Language: %s\n"     language))
+          ;; Show header arguments that have been set through
+          ;; properties (i.e. in property drawers or through
+          ;; #+PROPERTY)
 	  (funcall printf "Properties:\n")
-	  (funcall printf "\t:header-args \t%s\n" (org-entry-get (point) "header-args" t))
-	  (funcall printf "\t:header-args:%s \t%s\n" lang (org-entry-get (point) (concat "header-args:" lang) t))
-
+	  (funcall printf "\t:header-args \t%s\n" property-header-args)
+	  (funcall printf "\t:header-args:%s \t%s\n" language property-header-args-language)
+          ;; Show switches
 	  (when (funcall full switches) (funcall printf "Switches: %s\n" switches))
+          ;; Show default header arguments and header arguments that
+          ;; have been explicitly set in the current code block.
 	  (funcall printf "Header Arguments:\n")
 	  (dolist (pair (sort header-args
 			      (lambda (a b) (string< (symbol-name (car a))