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bug#12253: Restore window start position

From: Juri Linkov
Subject: bug#12253: Restore window start position
Date: Sat, 19 Jan 2013 12:17:30 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (x86_64-pc-linux-gnu) 
> +         isearch-win-pt-line (- (line-number-at-pos)
> +                                (line-number-at-pos (window-start)))
> ...
> !     (when isearch-win-pt-line (recenter isearch-win-pt-line)))

Why do you use `line-number-at-pos' and `recenter' instead of
`window-start' and `set-window-start'?
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