It sounds strange.

For me, this problem never happened on obscure then re-expose windows.

On the other hand, tmpfs should not be the reason either. The modified mark
fail to update at everywhere *except* for files in the home directory or
subdirectories of $HOME. For example, I tried /tmp, /var/tmp, a file
outside $HOME (while have edit permission), and use root to edit a file at
/. At all those positions I had this problem.

Best wishes,
Yi


On Mon, Dec 3, 2012 at 3:31 AM, Eli Zaretskii <eliz@gnu.org> wrote:

> > Date: Sun, 2 Dec 2012 17:51:26 +0900
> > From: Yi Wang <tririverwangyi@gmail.com>
> > Cc: Yi Wang <tririverwangyi@gmail.com>
> >
> > If I set frame-title as:
> >
> > (setq frame-title-format "%b  %* ")
> >
> > The modified mark * will display correctly for normal files. But for
> files
> > in /tmp (where tmpfs is enabled), the modified mark almost never appears
> > (though actually buffer is modified).
>
> Does this happen only for tmpfs volumes?
>
> If you obscure the frame with some other window of another
> application, and then re-expose it again, does the modification
> indication gets updated?
>