Re: change soft to hard lines and back

[Uwe Brauer <oub@mat.ucm.es>]

>>> "Hinrik" == Hinrik Örn Sigurðsson <hinrik.sig@gmail.com> 
>>> writes: 
 
   > You can use the function set-hard-newline-properties to mark 
   > all newlines in some range as hard. For the inverse you can 
   > remove the 'hard property with (remove-text-property START 
   > END '(hard nil)). 


Thanks but that function must be very new. For GNU emacs 26 I 
obtain

Debugger entered--Lisp error: (void-function remove-text-property) 
  remove-text-property(83 84 hard t) soften-newlines() 
  funcall-interactively(soften-newlines) 
  call-interactively(soften-newlines record nil) 
  command-execute(soften-newlines record) 
  execute-extended-command(nil "soften-newlines" "soft") 
  funcall-interactively(execute-extended-command nil 
  "soften-newlines" "soft") 
  call-interactively(execute-extended-command nil nil) 
  command-execute(execute-extended-command) 
 


So I tried remove-text-properties


(defun soften-newlines () (interactive) 
  (save-excursion 
;    (goto-char (point-min)) 
    (mail-text) (while (search-forward "\n" nil t) 
      (remove-text-properties (1- (point)) (point) 'hard nil))))

But it did not work, the hardlines were not removed.