bug#42406: Mouse-wheel scrolling can be flickering

[Alan Third]

On Wed, Dec 16, 2020 at 09:46:48AM +0100, martin rudalics wrote:
> >> So if Konrad sets the 'internal-border-width' frame parameter to 0 the
> >> slowdown should not happen.  Right?
> >
> > The cursor is still redrawn, so it may make no difference.
> 
> Because of the update mode lines flag?

I believe so, yes. When it's set, as far as I can see from looking at
the code we call clear_under_internal_border and update_frame, which
ultimately causes the cursor to be redrawn.

-- 
Alan Third