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Re: Whats the idiomatic way to erase a buffer?

From: Mario Lang
Subject: Re: Whats the idiomatic way to erase a buffer?
Date: Tue, 10 Dec 2019 18:47:15 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> (defun my-func (name)
>>   (with-current-buffer (get-buffer-create name)
>>     (let ((inhibit-read-only t))
>>       (erase-buffer))
> That look OK.
>> When I bury the buffer with 'q' and create the same
>> buffer, 'q' now complains:
>> Text is read-only: "Attempt to change text outside editable field"
> I think you want to M-x toggle-debug-on-error RET, then reproduce the
> bug so we can see the backtrace which will hopefully clarify what's
> going on.

It is not an error I'm afraid.

First time around, C-h k q gives me

q runs the command bury-buffer (found in sclang-scdoc-mode-map)

but the second time around I get

q runs the command self-insert-command (found in global-map)

However, major-mode evalutes to sclang-scdoc-mode in both cases.

And sclang-scdoc-mode is defined as:

(defvar sclang-scdoc-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map widget-browse-mode-map)
    (define-key map (kbd "C-c C-f") #'sclang-scdoc-find-schelp)
    (define-key map (kbd "C-c C-h") #'sclang-find-scdoc)
    (define-key map (kbd "C-c C-s") #'sclang-main-stop)
    (define-key map (kbd "C-c C-w") #'sclang-switch-to-workspace)
    (define-key map (kbd "C-M-x") 'sclang-eval-defun)

(define-derived-mode sclang-scdoc-mode widget-browse-mode "SCDoc"
  "Major mode for displaying SuperCollider Documentation."

> It may be that the buffer has overlays that survive the erasure (as
> 0-length overlays) and then re-grow as text is inserted.

Since I am using `widget-create' a lot, that might be a possibility.
How do I eliminate overlays in a buffer?


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