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bug#20466: 25.0.50; REGRESSION in `isearch-mode-map': <backspace> is not

From: Stefan Monnier
Subject: bug#20466: 25.0.50; REGRESSION in `isearch-mode-map': <backspace> is not translated to DEL
Date: Thu, 30 Apr 2015 19:12:07 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

> The "why" part was answered by Artur, who pointed to the bug report
> which triggered that change.
> I learned long ago that if you want to change the binding of DEL, you
> had better changed the binding of Backspace accordingly at the same time,

I strongly disagree here: following this kind of rule is what caused the
problem in the first place.

What you're basically saying is that we should give up on the
function-key-map binding which remaps `backspace' to DEL.

Clearly, this bug report shows that this remapping is harder to handle
right in the case of isearch-mode-map.

I think The Right Way to handle it is to bind (in isearch-mode-map)
`backspace' to `undefined' (so it hides bindings in lower-precedence
maps, but still lets the function-key-map remapping take place).


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