# HG changeset patch
# User Oleksandr Gavenko <gavenkoa@gmail.com>
# Date 1643668507 -7200
# Node ID c3345b0bcad03f18e2d9a8a8915f56f98c571118
# Parent  e09dfac4baf90ba7bec36c260cbd0cbbec56149a
so-long mode makes buffer read only. To erase the content we need to make buffer editable.

diff -r e09dfac4baf9 -r c3345b0bcad0 .emacs-my
--- a/.emacs-my	Thu Dec 09 14:38:16 2021 +0200
+++ b/.emacs-my	Tue Feb 01 00:35:07 2022 +0200
@@ -1265,6 +1265,7 @@
 (defun my--erase-buffer ()
   (interactive)
   (advice-add #'ask-user-about-supersession-threat :override #'identity)
+  (setq buffer-read-only nil)
   (erase-buffer)
   (when (buffer-file-name)
     (basic-save-buffer-1)