Your bug report

#63640: 29.0.91; (setq isearch-allow-scroll 'unlimited) does not work with pixel-scroll-precision-mode enabled.

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 63640@debbugs.gnu.org.

-- 
63640: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63640
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