[Bug 79888] SNA, regression: chromium UI sometimes doesn't redraw

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79888

--- Comment #12 from Alexander Mezin <mezin.alexander at gmail.com> ---
(In reply to comment #10)
> Sigh.
> 
> Please try
> 
> 
> diff --git a/src/sna/sna_dri2.c b/src/sna/sna_dri2.c
> index efc790f..3d3c50d 100644
> --- a/src/sna/sna_dri2.c
> +++ b/src/sna/sna_dri2.c
> @@ -1485,6 +1485,8 @@ can_xchg(struct sna * sna,
>         WindowPtr win = (WindowPtr)draw;
>         PixmapPtr pixmap;
>  
> +       return false;
> +
>         if (draw->type == DRAWABLE_PIXMAP)
>                 return false;
>  
> to disable xchg. If that is happening KDE is not unredirecting fullscreen
> windows and there is a race between the compositor reading from a texture
> and the GL app rendering it their fbo.

Unredirection is configurable, and usually I had that option enabled, but...
https://git.reviewboard.kde.org/r/111476/

Disabling xchg fixes everything. But Steam isn't fullscreen.

I'll test that xorg patch soon.

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