GNU bug report logs - #45380
28.0.50; Error in coloured output in Emacs 28.05(AUR package: emacs-git)

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From: miha <at> kamnitnik.top
To: Morgan Smith <Morgan.J.Smith <at> outlook.com>, Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Utkarsh Singh <utkarsh190601 <at> gmail.com>, 45380 <at> debbugs.gnu.org
Subject: bug#45380: 28.0.50; Error in coloured output in Emacs 28.05(AUR package: emacs-git)
Date: Mon, 25 Oct 2021 14:27:15 +0200

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Morgan Smith <Morgan.J.Smith <at> outlook.com> writes:

> Ya I sent a bug report (46332) about this exact same thing happening. 
> And then you fixed it so that it happened much less often. I didn't 
> notice until like a day after we closed that issue. My guess is that 
> there are two unrelated bugs that exhibit the exact same behavior and 
> you already fixed one.

I read that bug report and looked into this. As you said, there were two
bugs exhibiting similar behaviour. One was in ansi-color, fixed by Lars
in that bug report. The other bug, not yet fixed, is with esh-mode.el.
It uses 'insert-before-markers' to insert process output, pushing
forward the marker used by ansi-color.

A reliable reproducer is to open eshell and execute

  sh -c "printf 'NORMAL \033[32m'; sleep 1; printf 'GREEN \033[m\n'"

Please find the attached patch which fixes this.

[0001-Avoid-insert-before-markers-in-eshell.patch (text/x-patch, inline)]

From 3cda385ffd292ade869abf7e39cbb45ca10349fb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miha=20Rihtar=C5=A1i=C4=8D?= <miha <at> kamnitnik.top>
Date: Mon, 25 Oct 2021 14:09:30 +0200
Subject: [PATCH] Avoid insert-before-markers in eshell

* lisp/eshell/esh-mode.el (eshell-mode): Make window point advance on
insertion.
(eshell-output-filter): Don't use insert-before-markers.
---
 lisp/eshell/esh-mode.el | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lisp/eshell/esh-mode.el b/lisp/eshell/esh-mode.el
index 579b01f4d1..2b5a4647e0 100644
--- a/lisp/eshell/esh-mode.el
+++ b/lisp/eshell/esh-mode.el
@@ -315,6 +315,8 @@ eshell-mode
   (setq-local bookmark-make-record-function #'eshell-bookmark-make-record)
   (setq local-abbrev-table eshell-mode-abbrev-table)
 
+  (setq-local window-point-insertion-type t)
+
   (setq-local list-buffers-directory (expand-file-name default-directory))
 
   ;; always set the tab width to 8 in Eshell buffers, since external
@@ -696,13 +698,10 @@ eshell-output-filter
                   (setq oend (+ oend nchars)))
               ;; Let the ansi-color overlay hooks run.
               (let ((inhibit-modification-hooks nil))
-                (insert-before-markers string))
+                (insert string))
               (if (= (window-start) (point))
                   (set-window-start (selected-window)
                                     (- (point) nchars)))
-              (if (= (point) eshell-last-input-end)
-                  (set-marker eshell-last-input-end
-                              (- eshell-last-input-end nchars)))
               (set-marker eshell-last-output-start ostart)
               (set-marker eshell-last-output-end (point))
               (force-mode-line-update))
-- 
2.33.0

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