GNU bug report logs - #40338
27.0.60; c-fill-paragraph and after-change-functions

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From: Noam Postavsky <npostavs <at> gmail.com>
To: Yuan Fu <casouri <at> gmail.com>
Cc: 40338 <at> debbugs.gnu.org
Subject: bug#40338: 27.0.60; c-fill-paragraph and after-change-functions
Date: Mon, 30 Mar 2020 21:56:56 -0400

Yuan Fu <casouri <at> gmail.com> writes:

> (defun mytrack-hook (beg end len)
>   (if (> len 0)
>       ;; delete
>       (with-current-buffer trackbuf
>         (delete-region beg (+ beg len)))
>     ;; insert
>     (let ((content (buffer-substring beg end)))
>       (with-current-buffer trackbuf
>         (goto-char beg)
>         (insert content)))))

I'm not very familiar with either eglot or cc-mode, but I can say the
problem in your example lies with mytrack-hook: there can be kinds of
changes other than just pure delete or insert (replace, for example).
It can be fixed like this:

(defun mytrack-hook (beg end len)
  (when (> len 0)
    ;; Delete old text.
    (with-current-buffer "trackbuf"
      (delete-region beg (+ beg len))))
  ;; Insert new text.
  (let ((content (buffer-substring beg end)))
    (with-current-buffer "trackbuf"
      (goto-char beg)
      (insert content))))

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