bug#34019: 26.1; Changing ispell-program-name causes unwanted behavior

[Philip K.]

Hello,

I've recently updated my Debian installation from stretch (9, stable) to
buster (10, testing) and I got to install Emacs 26.1 + enchant. But
sadly the version in the Debian repository is still too old (1.6 vs
2.1). But when changing back to aspell, I was informed that aspell was
too old (0.6 vs 2.1).

It's easy to reproduce the bug, assuming one's enchant is also too
old. Simply eval

        (setq-default ispell-program-name (executable-find "enchant"))

try spell-checking any word (which should lead to an error), followed by

        (setq-default ispell-program-name (executable-find "aspell"))

or whatever one was using before. Any spell-checking should still not
work, and an error will be reported no matter what version of
aspell/hunspell/ispell one uses.

Looking through the code I noticed that the issue was simply caused by
forgetting to reset the variable `ispell-really-enchant`, thus resetting
it fixes the issue.

I hope I haven't messed something up in the process, since this is the
first time I'm sending a patch. If that's not the case, please tell me
and I'll be eager to fix any issue (related to this bug).

        Sincerely,
        Philip K.
    https://zge.us.to

From 25e0c36e60ee9737e92994684887fe9a4062b0cc Mon Sep 17 00:00:00 2001
From: Philip K <philip@warpmail.net>
Date: Wed, 9 Jan 2019 00:37:48 +0100
Subject: [PATCH] (re-)initialize ispell-really-enchant properly
To: bug-gnu-emacs@gnu.org

* lisp/textmodes/ispell.el: adding missing variable that should have
  been reset
---
 lisp/textmodes/ispell.el | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lisp/textmodes/ispell.el b/lisp/textmodes/ispell.el
index 22047598b2..0b07254af4 100644
--- a/lisp/textmodes/ispell.el
+++ b/lisp/textmodes/ispell.el
@@ -726,7 +726,7 @@ ispell-check-version
        ;; Make sure these variables are (re-)initialized to the default value
        (setq ispell-really-aspell nil
               ispell-really-hunspell nil
+              ispell-really-enchant nil
              ispell-encoding8-command nil)
 
        (goto-char (point-min))
---
2.20.1

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