bug#28412: 26.0.50; Let save-some-buffers accept write-contents-functions

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Kaushal Modi <kaushal.modi@gmail.com>
>> Date: Mon, 18 Sep 2017 16:16:05 +0000
>> 
>> - I use ggtags.el that creates a hidden (is that the right term for that?) buffer (starting with space) to fontify
>> code snippets using the file's major mode.
>> - The major mode I use (verilog-mode) sets write-file-functions to a non-nil value.
>> 
>> So each time I quit emacs, I get a prompt to save that hidden buffer " *Code-Fontify*" (which it didn't earlier, as
>> intended).
>> 
>> Details: https://github.com/leoliu/ggtags/issues/157
>> 
>> I suggested calling (set-buffer-modified-p nil) in that special buffer. 
>> 
>> But is that the best way to fix this? Or should save-some-buffers never try to save buffers whose names begin
>> with space?
>
> Exempting buffers whose name starts with a space sounds reasonable.
> Eric?

Also, there don't appear to be any built-in functions or regexps for
dealing with "hidden" buffers, I'm assuming:

(not (string-prefix-p " " (buffer-name buffer)))

is okay?