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

From: Eric Abrahamsen
Subject: bug#28412: 26.0.50; Let save-some-buffers accept write-contents-functions
Date: Mon, 18 Sep 2017 12:12:01 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> From: Kaushal Modi <address@hidden>
>> 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?

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