bug#72689: 31.0.50; Proposal to improve string-pixel-width

[David Ponce via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

On 31/08/2024 10:26 AM, Eli Zaretskii wrote:
>> Date: Thu, 22 Aug 2024 16:56:11 +0200
>> Cc: 72689@debbugs.gnu.org
>> From: David Ponce <da_vid@orange.fr>
>>
>>> LGTM, thanks.
>>
>> Thanks.  Please find attached 2 patches:
>>
>> 1. with-work-buffer.patch to introduce the new macro with-work-buffer.
>>
>> 2. string-pixel-width.patch to improve `string-pixel-width'.
> 
> Thanks, installed on the master branch, and closing the bug.

Many thanks!

Looking at the new version of string-pixel-width, I realized that I left
a call to erase-buffer that is not necessary.  Leaving it is not a problem,
but it would save a function call to remove it.

diff --git a/lisp/emacs-lisp/subr-x.el b/lisp/emacs-lisp/subr-x.el
index 83528f5c5dd..4cdb065feeb 100644
--- a/lisp/emacs-lisp/subr-x.el
+++ b/lisp/emacs-lisp/subr-x.el
@@ -405,7 +405,6 @@ string-pixel-width
                        (with-current-buffer buffer
                          face-remapping-alist))
          (kill-local-variable 'face-remapping-alist))
-      (erase-buffer)
        (insert string)
        ;; Prefer `remove-text-properties' to `propertize' to avoid
        ;; creating a new string on each call.

> 
> Please in the future try to submit patches using "git format-patch",
> as that makes the patches easier to apply.

Ok, I will have study this command.
I'm afraid I only use git in a very basic way.

Many thanks for your help!