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redundant redisplay

From: Tak Ota
Subject: redundant redisplay
Date: Tue, 27 Apr 2004 10:57:38 -0700 (PDT)

Some recent change, which I cannot identify, affects the redisplay
mechanism so that set-buffer-modified-p redisplays window contents
redundantly.  It creates occasional annoying partial screen flashing
as well as considerably slows down a buffer process which updates
modeline frequently.


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