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bug#24267: 24.5; When scrolling, parts of buffer are redrawn with a dela

From: Artyom
Subject: bug#24267: 24.5; When scrolling, parts of buffer are redrawn with a delay
Date: Sat, 20 Aug 2016 13:06:43 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 08/20/2016 10:22 AM, Eli Zaretskii wrote:

I cannot reproduce this: I don't see these redraws at all, using the
HTML page you pointed to.

It could be some issue specific to the default font you use (you don't
say which font is that).  Or some other issue local to, or triggered
by, your local setup.
I agree! However, there's still a chance of it being an Emacs issue since no other software I use (browsers, text editors, video players) show signs of tearing or incomplete redraws. (I thought it could be a bug in GTK, so I rebuilt Emacs with Lucid backend. It didn't fix the problem.)

The font I used is DejaVu Sans Mono. I tried setting frame font to GNU FreeFont Mono, but it didn't fix the problem either.
This all only started happening after I upgraded my system.
Unfortunately, the upgrade was pretty huge and so it's hard to
pinpoint a specific package that caused this. The version of Emacs
stayed the same.
Which is a serious argument in favor of my theory that this is not an
Emacs problem.

Maybe someone else bumped into such problems and could advise you
where to look.
Yep, that's what I was hoping for when I was writing the bug report. Even if nobody else is able to reproduce this, I would still appreciate any help with debugging it.

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