Hi Bastien,

Bastien writes:

Sébastien, have you been able to test this patch heavily and is it
still needed, or has it been made somehow irrelevant?  (I see it does
apply well on the bugfix branch, but not on main.)

Thanks for any feedback,

I've rebased the patch on main. It is still relevant (Ihor and I have provided
reproducers earlier in the thread).

I had done some testing, and some more recently. The patch only affects
latex-fragments and org entities to be edited which do not need to start at a beginning of line (latex-fragments, inline src blocks, footnote definitions).

Regards,

--
Sébastien Miquel
From b80124aa6edbd3b6992817dd8c37253705c82ae3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Miquel?= <sebastien.miq...@posteo.eu>
Date: Mon, 30 Aug 2021 23:18:41 +0200
Subject: [PATCH] org-src.el: Fix special editing of LaTeX fragments

* lisp/org-macs.el (org-do-remove-indentation): Add optional argument
to skip the first line.
* lisp/org-src.el (org-src--coordinates): Fix coordinates for inline
LaTeX fragments.
(org-src--contents-for-write-back): Do not indent first line for LaTeX
fragments.
(org-src--edit-element): Compute block-indentation according to parent
for LaTeX fragments.  Skip first line when removing common indentation
for LaTeX fragments.
---
 lisp/org-macs.el |  9 ++++++---
 lisp/org-src.el  | 18 ++++++++++++++----
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/lisp/org-macs.el b/lisp/org-macs.el
index bf1340b0a..1ef89a04d 100644
--- a/lisp/org-macs.el
+++ b/lisp/org-macs.el
@@ -326,17 +326,19 @@ it for output."
 
 ;;; Indentation

-(defun org-do-remove-indentation (&optional n)
+(defun org-do-remove-indentation (&optional n skip-fl)
   "Remove the maximum common indentation from the buffer.
 When optional argument N is a positive integer, remove exactly
-that much characters from indentation, if possible.  Return nil
-if it fails."
+that much characters from indentation, if possible.  When
+optional argument SKIP-FL is non-nil, skip the first
+line.  Return nil if it fails."
   (catch :exit
     (goto-char (point-min))
     ;; Find maximum common indentation, if not specified.
     (let ((n (or n
 		 (let ((min-ind (point-max)))
 		   (save-excursion
+                     (when skip-fl (forward-line))
 		     (while (re-search-forward "^[ \t]*\\S-" nil t)
 		       (let ((ind (current-indentation)))
 			 (if (zerop ind) (throw :exit nil)
@@ -344,6 +346,7 @@ if it fails."
 		   min-ind))))
       (if (zerop n) (throw :exit nil)
 	;; Remove exactly N indentation, but give up if not possible.
+        (when skip-fl (forward-line))
 	(while (not (eobp))
 	  (let ((ind (progn (skip-chars-forward " \t") (current-column))))
 	    (cond ((eolp) (delete-region (line-beginning-position) (point)))
diff --git a/lisp/org-src.el b/lisp/org-src.el
index 3b25fad60..d78f46186 100644
--- a/lisp/org-src.el
+++ b/lisp/org-src.el
@@ -327,7 +327,8 @@ a cons cell (LINE . COLUMN) or symbol `end'.  See also
   (if (>= pos end) 'end
     (org-with-wide-buffer
      (goto-char (max beg pos))
-     (cons (count-lines beg (line-beginning-position))
+     (cons (count-lines (save-excursion (goto-char beg) (line-beginning-position))
+                        (line-beginning-position))
 	   ;; Column is relative to the end of line to avoid problems of
 	   ;; comma escaping or colons appended in front of the line.
 	   (- (point) (min end (line-end-position)))))))
@@ -445,6 +446,7 @@ Assume point is in the corresponding edit buffer."
 		  org-src--content-indentation
 		0))))
 	(use-tabs? (and (> org-src--tab-width 0) t))
+        (preserve-fl (eq org-src--source-type 'latex-fragment))
 	(source-tab-width org-src--tab-width)
 	(contents (org-with-wide-buffer
                    (let ((eol (line-end-position)))
@@ -466,7 +468,8 @@ Assume point is in the corresponding edit buffer."
       ;; Add INDENTATION-OFFSET to every line in buffer,
       ;; unless indentation is meant to be preserved.
       (when (> indentation-offset 0)
-	(while (not (eobp))
+	(when preserve-fl (forward-line))
+        (while (not (eobp))
 	  (skip-chars-forward " \t")
           (when (or (not (eolp))                               ; not a blank line
                     (and (eq (point) (marker-position marker)) ; current line
@@ -518,7 +521,13 @@ Leave point in edit buffer."
 	     (source-tab-width (if indent-tabs-mode tab-width 0))
 	     (type (org-element-type datum))
 	     (block-ind (org-with-point-at (org-element-property :begin datum)
-			  (current-indentation)))
+                          (cond
+                           ((save-excursion (skip-chars-backward " \t") (bolp))
+			    (current-indentation))
+                           ((org-element-property :parent datum)
+                            (org--get-expected-indentation
+                             (org-element-property :parent datum) nil))
+                           (t (current-indentation)))))
 	     (content-ind org-edit-src-content-indentation)
              (blank-line (save-excursion (beginning-of-line)
                                          (looking-at-p "^[[:space:]]*$")))
@@ -548,7 +557,8 @@ Leave point in edit buffer."
 	(insert contents)
 	(remove-text-properties (point-min) (point-max)
 				'(display nil invisible nil intangible nil))
-	(unless preserve-ind (org-do-remove-indentation))
+	(let ((lf (eq type 'latex-fragment)))
+          (unless preserve-ind (org-do-remove-indentation (and lf block-ind) lf)))
 	(set-buffer-modified-p nil)
 	(setq buffer-file-name nil)
 	;; Initialize buffer.
-- 
2.33.0

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