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

[Artyom <yom@artyom.me>]

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.