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bug#27634: 25.2.1; C-g does not quit register-read-with-preview

From: Paul Rankin
Subject: bug#27634: 25.2.1; C-g does not quit register-read-with-preview
Date: Tue, 11 Jul 2017 15:07:43 +1000

> On 11 Jul 2017, at 2:48 pm, Tino Calancha <address@hidden> wrote:
>> On Tue, 11 Jul 2017, Paul Rankin wrote:
>> One overlooked thing about Tino's solution is that C-g is a keystroke and 
>> keyboard-quit is a function, which obviously aren't necessarily equivalent. 
>> What if the user remaps keyboard quit to "7"?
> I thought about that, but i discarded because i think binding something
> other that `keyboard-quit' to `C-g' is a misuse.  The Emacs manual is full
> of mentions to `C-g' as `keyboard-quit'.
> There is even the following remark in the tips section:
> "don't bind a key sequence ending in @key{C-g}, since that
> is commonly used to cancel a key sequence."
> If a user want to ignore such kind of advice he/she should
> not expect everything will work the same.

I'm gonna do this just to mess with you 😉

> Maybe we can fix this so that `register-read-with-preview'
> will work with `C-g' bound to `my-cool-foo-command'; but we
> cannot assure that no other Emacs part is affected because such
> misguided `C-g' binding.  We must encourage users to follow
> good practices.

While I think encouragement and enforcement are different things, the point 
about C-g is more what if the user *also* binds keyboard-quit to "7". In this 
case the user expects 7 to call keyboard-quit, not just C-g.

Also as Eli said ESC ESC is supposed to keyboard quit I think.

But main thing, as in life, better to look for what what you want than control 
for what you don't want.

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