Chong Yidong <cyd@stupidchicken.com> writes:

> Naohiro Aota <naota@elisp.net> writes:
>
>> Current behavior causes tab width to be doubled and so indent to be
>> strange.
>
> I don't see any strange behavior.  (Tabs are displayed specially in
> Emacs, so I don't know how you're viewing them.)  Please provide a
> reproducible test case.

Using fonts whose spacing is DUAL cause the problem.  M+ font is one of
them. (1)

--8<---------------cut here---------------start------------->8---
12345678901234567890
	<-tab
(add-hook 'after-save-hook
	  (function (lambda ()
		      (if (string= (expand-file-name "~/.emacs.el")
				   (buffer-file-name))
			  (save-excursion
			    (byte-compile-file "~/.emacs.el"))))))
--8<---------------cut here---------------end--------------->8---

(unpatched) emacs -q -fn "M+ 1m", open <above file>