bug#42406: Mouse-wheel scrolling can be flickering

[martin rudalics]

>> I haven't looked into it but can't running that code be simply
>> suppressed when no internal border should be drawn anyway?  That is,
>> when the width is zero which should be the default.
>
> The default is 2 on the NS port, and on non-GTK X builds it would
> appear to be 1.
>
> I'm inclined to just leave it as-is. If people want to try setting it
> to zero themselves they can, because as you say it doesn't do anything
> if it's 0.

So if Konrad sets the 'internal-border-width' frame parameter to 0 the
slowdown should not happen.  Right?

martin