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bug#49536: 28.0.50; Confusing dolist-with-progress-reporter behaviour

From: Philip Kaludercic
Subject: bug#49536: 28.0.50; Confusing dolist-with-progress-reporter behaviour
Date: Mon, 12 Jul 2021 15:33:44 +0000

When evaluating this form

        (dolist-with-progress-reporter (i (number-sequence 1 4))
            "Doing stuff"
          (sleep-for 1))

I would expect to get the messages

Doing stuff...
Doing stuff...25%
Doing stuff...50%
Doing stuff...75%
Doing stuff...Done

each update after one argument of the list has been handled. Instead, it
seems I get

Doing stuff...
Doing stuff...33%
Doing stuff...66%
Doing stuff...100%
Doing stuff...Done

This confuses me, because after "processing" one out of four elements, I
wouldn't expect the message to say I already finished a third. And on
the other side, I am still not done after reaching 100%, and in this
case, am still waiting for the last element to be processed.

I am not sure if this is intentional, but in case it is no, the
following patch should fix it:

>From f7da2585886bd4fd795713a605ff6bd17a4c337a Mon Sep 17 00:00:00 2001
From: Philip Kaludercic <philipk@posteo.net>
Date: Mon, 12 Jul 2021 17:26:43 +0200
Subject: [PATCH] Fix dolist-with-progress-reporter behaviour

* subr.el (dolist-with-progress-reporter): Use the length of list
  argument as maximal value the reporter with reach
 lisp/subr.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/subr.el b/lisp/subr.el
index e49c277335..20f40be40d 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -5880,7 +5880,7 @@ dolist-with-progress-reporter
            (,count 0)
            (,list ,(cadr spec)))
        (when (stringp ,prep)
-         (setq ,prep (make-progress-reporter ,prep 0 (1- (length ,list)))))
+         (setq ,prep (make-progress-reporter ,prep 0 (length ,list))))
        (dolist (,(car spec) ,list)
          (progress-reporter-update ,prep (setq ,count (1+ ,count))))

In GNU Emacs 28.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, cairo 
version 1.16.0)
 of 2021-06-20 built on icterid
Repository revision: 869db473cbd510270faec2ba43dd4a5ba10b0020
Repository branch: feature/rcirc-update
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Configured using:
 'configure --with-native-compilation'

Configured features:

Important settings:
  value of $EMACSLOADPATH: 
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  TeX-PDF-mode: t
  paredit-mode: t
  flymake-mode: t
  flyspell-mode: t
  outline-minor-mode: t
  rcirc-track-minor-mode: t
  display-time-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  winner-mode: t
  electric-pair-mode: t
  recentf-mode: t
  save-place-mode: t
  savehist-mode: t
  show-paren-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/philip/.config/emacs/elpa/transient-0.3.6/transient hides 

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inotify lcms2 dynamic-setting system-font-setting font-render-setting
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Memory information:
((conses 16 2097065 1884485)
 (symbols 48 83251 983)
 (strings 32 372750 132457)
 (string-bytes 1 11364694)
 (vectors 16 144289)
 (vector-slots 8 3652510 1692147)
 (floats 8 1786 6127)
 (intervals 56 83336 56698)
 (buffers 992 157))

        Philip K.

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