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Sender: Maarten Grachten <maarten.grachten@gmail.com>
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Date: Tue, 06 Aug 2013 11:55:38 +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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Hi Peter,

Thanks a lot for the explanation, and the patch, it works perfectly! 
Based on your explanation however, I tried the following as well:

ACC_HISTFILE="${HOME}/.accumulated-history"

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

i.e. before doing the search on the accumulated history, set the 
variable HISTNO to just beyond the last line of that history file. This 
also seems to work without the patch you provided, however I cannot 
really judge if there are any unintended side-effects with this approach.

Many thanks again for helping me out! I appreciate the effort.

Maarten