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Sender: Maarten Grachten <maarten.grachten@gmail.com>
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Date: Tue, 06 Aug 2013 12:11:12 +0200
From: Maarten Grachten <maarten.grachten@ofai.at>
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To: zsh-users@zsh.org
Subject: Re: search through alternative HISTFILE
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Just for the record. I figured out that it is necessary to reset HISTNO 
to its old value after the search on accumulated history is done 
(otherwise the normal search will be confused):

function accumulated-history-incremental-search-backward () {
     fc -p $ACC_HISTFILE
     HISTNO=$(( $( wc -l < $ACC_HISTFILE ) + 1 ))
     zle history-incremental-search-backward
     fc -P
     HISTNO=$(( $( wc -l < $HISTFILE ) + 1 ))
}

Maarten