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From: martin rudalics <rudalics@gmx.at>
Newsgroups: gmane.emacs.devel
Subject: Re: GTK scroll bar question
Date: Wed, 30 Jul 2014 14:39:01 +0200
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To: Dmitry Antipov <dmantipov@yandex.ru>, 
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 > Can someone explain why an attached patch works fine with GTK2 but
 > creates scroll bar artifacts with GTK3?  GTK3 3.10.9, GTK2 2.24.22.

I suppose it's related to changes in GTK3.  I often see this:

http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg02228.html

And there's also bug#17982.

martin