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Re: Questions about isearch

From: Stephen Berman
Subject: Re: Questions about isearch
Date: Sat, 28 Nov 2015 17:14:00 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

On Sat, 28 Nov 2015 00:04:33 +0000 Artur Malabarba <address@hidden> wrote:

> On 27 Nov 2015 9:18 pm, "Stephen Berman" <address@hidden> wrote:
>> > No. We don't support having multiple characters match a single string.
>> Is this why "ss" does not match the German letter "ß"? 
> Indeed. 
>> I assume the
>> reason "s" does not match "ß" is that the latter does not have a
>> decomposition including "s", whereas the decomposition of e.g. "ff" does
>> include "f", correct? 
> Yes. 
>> In fact, looking at the value of character-fold-table, it seems to me
>> that the current implementation of folding based on character
>> decomposition often yields surprising results: e.g. "f" matches not only
>> "ff" but also "㎙" and "ffl", but "m" and "l" fail to match the latter two,
>> respectively. 
> This was by choice, and it would be trivial to change. Do others find it 
> surprising? 
>> Another shortcoming is that the decompositions do not respect
>> case-folding, e.g. "f" fails to match "ℱ" and "℻" (with case-folding
>> enabled), whereas "F" does match them, but fails to match "ff". 
> True. This can be fixed, I think. Could you file a bug report so we don't 
> forget? 

Although you already said you'd be working on these issues (thanks), I
filed a bug for the record (bug#22038).

Steve Berman

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