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bug#22479: 25.0.50; isearch and query-replace histories do not remember

From: Dima Kogan
Subject: bug#22479: 25.0.50; isearch and query-replace histories do not remember if we were looking for symbols
Date: Mon, 01 Feb 2016 21:32:08 -0800
User-agent: mu4e 0.9.11; emacs

Juri Linkov <juri@linkov.net> writes:

>>> 5. More ideas? ;)
>> - We can retain the two histories: regex, non-regex
>> - Any fancy (word, symbol, etc) searches can be stored into the regex
>>   history, bookmarked with the appropriate regexen ("\_<", "\_>" for
>>   instance)
>> - When reading the history to present to the user, these can be parsed
>>   out. So for instance when the user looks through the symbol-search
>>   history by hitting
>>   M-s _
>>   C-s
>>   emacs can look through the regex history, only selecting entries in
>>   \_<...\_>. The C-M-s history can either include all of these, or show
>>   only unbookmarked entries; both would be ok, I think.
> This approach is compromising but unreliable

Indeed it is a compromise. It feels to me to be much better than what we
have now, and the issues aren't too significant... I think...

> (doesn't distinguish between the case when the user uses the symbol
> search M-s _ or types \_<...\_> directly in the regexp search)

True, but I think this is OK. The symbol-search history would include
M-s _ searches AND those C-M-s searches where the intent was to look for
symbols; I think this is fine. The regex-search history would include
all symbol searches also; maybe that is less fine, but it isn't crazy.
The text search history would include none of these; this is GOOD, and
is not what we do now.

> (need to remember other search parameters like case-fold and
> lax-whitespace).

Hmmm. This clearly requires metadata so some of your other, more
intrusive proposals would be required to handle this. The above proposal
would work for word and symbol searches. I think fixing that would be
worth it. Do yall just want to leave it alone?

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