Re: [Emacs-diffs] master 9ffb6ce 5/5: Quoting fixes in lisp/international and lisp/leim

[Paul Eggert <eggert@cs.ucla.edu>]

Alan Mackenzie wrote:
> the original scenario had nothing to do with
> `text-quoting-style'.

There seemed little point to having two variables to control text quoting 
behavior, one for initial inference of display quoting and one for translation 
of help strings and diagnostics.  So I used the same variable for all three.

> You've cut so much context

To help move things forward, here's a complete copy of the message I replied to, 
along with a copy of my reply inserted at the appropriate spot, so that you can 
see the complete context.

> Alan Mackenzie wrote:
>> Hello, Paul.
>>
>> On Wed, Sep 02, 2015 at 09:32:42AM -0700, Paul Eggert wrote:
>>> Alan Mackenzie wrote:
>>>> Using my  standard font, lat1-16, the curly quotes use the same glyphs as
>>>> ` and ', hence are visibly indistinguishable from them.
>>
>>> That's no longer true as of yesterday's master commit
>>> 1a3518e7c361a9ceaa017c1334a83d14e0651a4e.
>>
>> I'm afraid it is still true.  After doing a C-h f c-mode, apparent
>> quotes were in the buffer.  Checking them with C-u C-x =, they were
>> indeed curly quotes, but were displayed the same as ASCII quotes.

> After fooling around with it on my Linux console, I came up with a scenario that had the behavior you describe.  In this scenario I set the LC_ALL environment variable to en_US.UTF-8 even though the Linux console could display only a few non-ASCII characters (so in some sense this is a misconfiguration).  And I put (setq text-quoting-style 'grave) into my ~/.emacs file, indicating that I wanted traditional ASCII quoting.  Emacs didn't look at the text-quoting-style setting when configuring the display table at startup, which seems wrong, so I patched master to fix that.  Please do a git pull and give it a try.  If it still doesn't work for you, please send the output of the shell command ‘locale’ just before invoking Emacs, and the output of the command ‘echo $TERM’, and a copy of the Lisp code that sets text-quoting-style in your ~/.emacs file.  Thanks.

>>> On a terminal that cannot display curved quotes, ...
>>
>> Currently, my terminal is not such a one.  It _can_ display curly
>> quotes, but only identically to ASCII quotes.  `char-displayable-p'
>> returns 'unicode for them.
>>
>> The issue is not so much whether a terminal can display curly quotes,
>> rather it's whether a user wants them to be used or not.
>>
>>> .... Emacs master now uses different glyphs for the quotes’ ASCII
>>> replacements, because the replacements are shadowed.  The shadowed
>>> glyphs are easily distinguishable on my Linux console.  Users
>>> shouldn’t need to configure Emacs specially, or their Linux console
>>> specially, to get this behavior.  So this objection no longer applies.
>>