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bug#49593: Emacs overrides normal-erase-is-backspace

From: Lars Ingebrigtsen
Subject: bug#49593: Emacs overrides normal-erase-is-backspace
Date: Fri, 16 Jul 2021 12:04:42 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

"Paul W. Rankin" <pwr@bydasein.com> writes:

> normal-erase-is-backspace is maybe; marked as "CHANGED outside of
> Customize"

The doc string does say:

Setting this variable with setq doesn't take effect.  Programmatically,
call `normal-erase-is-backspace-mode' (which see) instead.

But setting it with `custom-set-variables' should work, I'd have
thought?  Hm...

(custom-set-variables '(normal-erase-is-backspace t))

sets it to `maybe', so it's not a startup problem (there's been some
with Customize)...

Hm, looking at the code to `normal-erase-is-backspace-mode', I don't see
how that's supposed to work at all.  The value is only used in
`normal-erase-is-backspace-setup-frame', and calling
`normal-erase-is-backspace-mode' doesn't actually change the value of
the variable, which explains why `custom-set-variables' does nothing.

The following change seems to fix the issue:

diff --git a/lisp/simple.el b/lisp/simple.el
index 322693f631..01851e0a0a 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -9505,9 +9505,9 @@ normal-erase-is-backspace
   :set (lambda (symbol value)
         ;; The fboundp is because of a problem with :set when
         ;; dumping Emacs.  It doesn't really matter.
-        (if (fboundp 'normal-erase-is-backspace-mode)
-            (normal-erase-is-backspace-mode (or value 0))
-          (set-default symbol value))))
+        (when (fboundp 'normal-erase-is-backspace-mode)
+          (normal-erase-is-backspace-mode (or value 0)))
+        (set-default symbol value)))
 (defun normal-erase-is-backspace-setup-frame (&optional frame)
   "Set up `normal-erase-is-backspace-mode' on FRAME, if necessary."

But is that the correct fix?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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