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bug#23425: master branch: `message' wrongly corrupts ' to curly quote.

From: Paul Eggert
Subject: bug#23425: master branch: `message' wrongly corrupts ' to curly quote.
Date: Fri, 2 Jun 2017 14:47:42 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0

On 06/02/2017 02:02 PM, Alan Mackenzie wrote:
How about transferring this discussion to emacs-devel, so that more
people would be able to see it.

We had that discussion there already, and I doubt whether it’d be worthwhile to repeat it. Of course you're free to take it there again if you like.

The default behaviour has been changed already, and that change has
caused problems and will cause further problems.

I expect that most of the practical problems have been shaken out already with the changes published in Emacs 25.1 last year, so that most of this cost has already been paid.

I propose restoring the default to what it was in Emacs 24.  For
simplicity's sake, only % should be special, and for translating quotes
we could introduce %' and %`, such that quote translation happens only
when a %' or %` is present.

That kind of approach was proposed way back when. It doesn’t address quotes in doc strings, though. More generally, a problem with this sort of approach is that although it simplifies ‘message’ (obviously), this is at the price of complicating everything else. I estimate we’d need to change 10,000 lines of Emacs source code to make that change to ‘message’. (This is a just a quick estimate based on ‘grep '".*`.*"'’.) The resulting source code would typically be a bit harder to read than it is now.

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