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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Fri, 12 Feb 2016 02:05:39 -0800
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Comments: In reply to Sebastian Gniazdowski <sgniazdowski@gmail.com>
        "Re: Slow highlighting (Re: "drop-in replacement" and transpose-words-match)" (Feb 11,  5:11pm)
References: <160111233259.ZM6719@torch.brasslantern.com> 
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To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Slow highlighting (Re: "drop-in replacement" and transpose-words-match)
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On Feb 11,  5:11pm, Sebastian Gniazdowski wrote:
} Subject: Re: Slow highlighting (Re: "drop-in replacement" and transpose-wo
}
} -      integer offset=${${buf[start_pos+1,-1]}[(i)$needle]}
} +      # Len-start_pos drops one character, but it should do it, as start_pos
} +      # starts from next, not from "start_pos", character
} +      integer offset=${${buf: start_pos: len-start_pos}[(i)$needle]}

Hrm.  This goes back to the discussion from several months ago about
$string[left,right] using the same generic code as $array[left,right],
if I'm recalling that thread correctly.  The ${string:left:len} form
on the other hand uses a scalar-specific approach.